Vulnerability-Lookup

alsa-2026:65158

Vulnerability from osv_almalinux

Published

2026-09-08 00:00

Modified

2026-09-09 07:49

Summary

Important: thunderbird security update

Details

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)
firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74987)
firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)
firefox: thunderbird: Information disclosure in the DOM: UI Events & Focus Handling component (CVE-2026-74971)
firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-74946)
firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)
firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component (CVE-2026-74949)
firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74990)
firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)
firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)
firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)
firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)
firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)
firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)
firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)
firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)
firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)
firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)
firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)
firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-74944)
firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)
firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:65158	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-74934	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74935	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74939	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74940	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74942	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74943	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74944	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74945	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74946	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74949	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74957	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74959	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74960	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74962	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74963	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74965	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74971	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74972	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74973	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74974	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74976	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74987	REPORT
	https://access.redhat.com/security/cve/CVE-2026-74990	REPORT
	https://bugzilla.redhat.com/2517820	REPORT
	https://bugzilla.redhat.com/2517823	REPORT
	https://bugzilla.redhat.com/2517826	REPORT
	https://bugzilla.redhat.com/2517831	REPORT
	https://bugzilla.redhat.com/2517834	REPORT
	https://bugzilla.redhat.com/2517835	REPORT
	https://bugzilla.redhat.com/2517836	REPORT
	https://bugzilla.redhat.com/2517837	REPORT
	https://bugzilla.redhat.com/2517839	REPORT
	https://bugzilla.redhat.com/2517841	REPORT
	https://bugzilla.redhat.com/2517845	REPORT
	https://bugzilla.redhat.com/2517849	REPORT
	https://bugzilla.redhat.com/2517851	REPORT
	https://bugzilla.redhat.com/2517853	REPORT
	https://bugzilla.redhat.com/2517856	REPORT
	https://bugzilla.redhat.com/2517859	REPORT
	https://bugzilla.redhat.com/2517860	REPORT
	https://bugzilla.redhat.com/2517862	REPORT
	https://bugzilla.redhat.com/2517863	REPORT
	https://bugzilla.redhat.com/2517866	REPORT
	https://bugzilla.redhat.com/2517868	REPORT
	https://bugzilla.redhat.com/2517872	REPORT
	https://bugzilla.redhat.com/2517874	REPORT
	https://errata.almalinux.org/9/ALSA-2026-65158.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "thunderbird"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "140.14.0-1.el9_8.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Mozilla Thunderbird is a standalone mail and newsgroup client.  \n\nSecurity Fix(es):  \n\n  * firefox: thunderbird: Site isolation issue in the Graphics: CanvasWebGL component (CVE-2026-74934)\n  * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74987)\n  * firefox: thunderbird: Use-after-free in the Graphics: ImageLib component (CVE-2026-74943)\n  * firefox: thunderbird: Information disclosure in the DOM: UI Events \u0026 Focus Handling component (CVE-2026-74971)\n  * firefox: Privilege escalation in the Shell Integration component (CVE-2026-74965)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-74946)\n  * firefox: Race condition, use-after-free in the Graphics component (CVE-2026-74973)\n  * firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component (CVE-2026-74949)\n  * firefox: thunderbird: Internally found bugs fixed in Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154 (CVE-2026-74990)\n  * firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-74940)\n  * firefox: thunderbird: Site isolation issue in the WebExtensions component (CVE-2026-74960)\n  * firefox: thunderbird: Mitigation bypass in the Storage: Cache API component (CVE-2026-74959)\n  * firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-74976)\n  * firefox: thunderbird: Same-origin policy bypass in the Graphics: ImageLib component (CVE-2026-74974)\n  * firefox: thunderbird: Mitigation bypass in the Safe Browsing component (CVE-2026-74957)\n  * firefox: Privilege escalation in the Remote Settings Client component (CVE-2026-74942)\n  * firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-74939)\n  * firefox: thunderbird: Information disclosure in the DOM: Push Subscriptions component (CVE-2026-74972)\n  * firefox: thunderbird: Information disclosure in the Graphics: Text component (CVE-2026-74945)\n  * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-74963)\n  * firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-74944)\n  * firefox: Site isolation issue in the Networking: Cookies component (CVE-2026-74962)\n  * firefox: thunderbird: Privilege escalation in the DOM: Networking component (CVE-2026-74935)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:65158",
  "modified": "2026-09-09T07:49:40Z",
  "published": "2026-09-08T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:65158"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74934"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74935"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74939"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74940"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74942"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74943"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74944"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74945"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74946"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74949"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74957"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74959"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74960"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74962"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74963"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74965"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74971"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74972"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74973"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74974"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74976"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74987"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-74990"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517820"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517823"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517826"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517831"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517834"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517835"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517836"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517837"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517839"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517841"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517845"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517849"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517851"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517853"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517856"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517859"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517860"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517862"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517863"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517866"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517868"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517872"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517874"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-65158.html"
    }
  ],
  "related": [
    "CVE-2026-74934",
    "CVE-2026-74987",
    "CVE-2026-74943",
    "CVE-2026-74971",
    "CVE-2026-74965",
    "CVE-2026-74946",
    "CVE-2026-74973",
    "CVE-2026-74949",
    "CVE-2026-74990",
    "CVE-2026-74940",
    "CVE-2026-74960",
    "CVE-2026-74959",
    "CVE-2026-74976",
    "CVE-2026-74974",
    "CVE-2026-74957",
    "CVE-2026-74942",
    "CVE-2026-74939",
    "CVE-2026-74972",
    "CVE-2026-74945",
    "CVE-2026-74963",
    "CVE-2026-74944",
    "CVE-2026-74962",
    "CVE-2026-74935"
  ],
  "summary": "Important: thunderbird security update"
}

CVE-2026-74934 (GCVE-0-2026-74934)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 20:09

Title

Site isolation issue in the Graphics: CanvasWebGL component

Summary

Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:08 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-284 - Improper Access Control
CWE-346 - Origin Validation Error

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2050584
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

satyamasd

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-74934",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T20:08:52.091241Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-200",
                "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor",
                "lang": "en",
                "type": "CWE"
              }
            ]
          },
          {
            "descriptions": [
              {
                "cweId": "CWE-284",
                "description": "CWE-284 Improper Access Control",
                "lang": "en",
                "type": "CWE"
              }
            ]
          },
          {
            "descriptions": [
              {
                "cweId": "CWE-346",
                "description": "CWE-346 Origin Validation Error",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T20:09:50.955Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "115.*",
              "status": "unaffected",
              "version": "115.39",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "satyamasd"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
            }
          ],
          "value": "Site isolation issue in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T18:54:55.765Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2050584"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-79/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
        }
      ],
      "title": "Site isolation issue in the Graphics: CanvasWebGL component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-74934",
    "datePublished": "2026-08-18T12:23:27.344Z",
    "dateReserved": "2026-08-17T11:57:25.126Z",
    "dateUpdated": "2026-08-21T20:09:50.955Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-74935 (GCVE-0-2026-74935)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 03:55

Title

Privilege escalation in the DOM: Networking component

Summary

Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 00:00 UTC

CWE

CWE-269 - Improper Privilege Management

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2051013
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Yaqoub Aldurayhim

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
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              "content": {
                "id": "CVE-2026-74935",
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          "lang": "en",
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            }
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          "value": "Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
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        "dateUpdated": "2026-08-18T18:54:56.800Z",
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
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    }
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    "dateReserved": "2026-08-17T11:57:27.168Z",
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    "state": "PUBLISHED"
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CVE-2026-74939 (GCVE-0-2026-74939)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 03:55

Title

Privilege escalation in the DOM: Navigation component

Summary

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 00:00 UTC

CWE

CWE-269 - Improper Privilege Management

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2054416
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

choeseyeong

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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            "other": {
              "content": {
                "id": "CVE-2026-74939",
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              "lessThanOrEqual": "140.*",
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        "dateUpdated": "2026-08-18T18:54:58.812Z",
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        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
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CVE-2026-74940 (GCVE-0-2026-74940)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 20:12

Title

Use-after-free in the Graphics: Text component

Summary

Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:11 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2054842
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

kiyong

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
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              "attackVector": "NETWORK",
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        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
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CVE-2026-74942 (GCVE-0-2026-74942)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 03:55

Title

Privilege escalation in the Remote Settings Client component

Summary

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 00:00 UTC

CWE

CWE-269 - Improper Privilege Management

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2056571
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Gal Ankonina

Show details on NVD website

JSON

To clipboard

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CVE-2026-74943 (GCVE-0-2026-74943)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 20:14

Title

Use-after-free in the Graphics: ImageLib component

Summary

Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:13 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2057308
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Abdulaziz Alasaiqah

Show details on NVD website

JSON

To clipboard

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CVE-2026-74944 (GCVE-0-2026-74944)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 20:15

Title

Use-after-free in the DOM: Core & HTML component

Summary

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:14 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2057778
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Amy Burnett of OpenAI

Show details on NVD website

JSON

To clipboard

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CVE-2026-74945 (GCVE-0-2026-74945)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 19:58

Title

Information disclosure in the Graphics: Text component

Summary

Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 19:58 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2057808
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Abdulaziz Alasaiqah

Show details on NVD website

JSON

To clipboard

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      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "115.*",
              "status": "unaffected",
              "version": "115.39",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Abdulaziz Alasaiqah"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
            }
          ],
          "value": "Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T18:55:04.649Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2057808"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-79/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
        }
      ],
      "title": "Information disclosure in the Graphics: Text component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-74945",
    "datePublished": "2026-08-18T12:23:29.811Z",
    "dateReserved": "2026-08-17T11:57:49.125Z",
    "dateUpdated": "2026-08-21T19:58:50.816Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-74946 (GCVE-0-2026-74946)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-08-21 03:55

Title

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Summary

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 00:00 UTC

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

mozilla mitre root

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2059997
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.39 , ≤ 115.* (rpm) Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

locust1b

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-74946",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-20T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-119",
                "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T03:55:34.715Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "115.*",
              "status": "unaffected",
              "version": "115.39",
              "versionType": "rpm"
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            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "locust1b"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
            }
          ],
          "value": "Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T18:55:05.723Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2059997"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-75/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-79/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
        }
      ],
      "title": "Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-74946",
    "datePublished": "2026-08-18T12:23:30.090Z",
    "dateReserved": "2026-08-17T11:57:51.255Z",
    "dateUpdated": "2026-08-21T03:55:34.715Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-74949 (GCVE-0-2026-74949)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-09-01 21:25

Title

Privilege escalation due to use-after-free in the Graphics: Canvas2D component

Summary

Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2060245
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.14 , ≤ 140.* (rpm) Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

r00tdaddy

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-74949",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-20T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T03:55:33.522Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.14",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "r00tdaddy"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
            }
          ],
          "value": "Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-01T21:25:04.789Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2060245"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-76/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-77/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-79/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-80/"
        }
      ],
      "title": "Privilege escalation due to use-after-free in the Graphics: Canvas2D component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-74949",
    "datePublished": "2026-08-18T12:23:30.578Z",
    "dateReserved": "2026-08-17T11:57:57.441Z",
    "dateUpdated": "2026-09-01T21:25:04.789Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

alsa-2026:65158

Vulnerability from osv_almalinux

CVE-2026-74934 (GCVE-0-2026-74934)

CVE-2026-74935 (GCVE-0-2026-74935)

CVE-2026-74939 (GCVE-0-2026-74939)

CVE-2026-74940 (GCVE-0-2026-74940)

CVE-2026-74942 (GCVE-0-2026-74942)

CVE-2026-74943 (GCVE-0-2026-74943)

CVE-2026-74944 (GCVE-0-2026-74944)

CVE-2026-74945 (GCVE-0-2026-74945)

CVE-2026-74946 (GCVE-0-2026-74946)

CVE-2026-74949 (GCVE-0-2026-74949)

Tags

Sightings

Nomenclature