Vulnerability-Lookup

GHSA-QMCG-GF85-VJV7

Vulnerability from github – Published: 2026-08-18 15:31 – Updated: 2026-08-18 15:31

Details

Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74988"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-18T13:17:40Z",
    "severity": null
  },
  "details": "Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.",
  "id": "GHSA-qmcg-gf85-vjv7",
  "modified": "2026-08-18T15:31:44Z",
  "published": "2026-08-18T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74988"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2018164%2C2045404%2C2045507%2C2045711%2C2052403%2C2053174%2C2054643%2C2054667%2C2054671%2C2054674%2C2054687%2C2054717%2C2054761%2C2054787%2C2055676%2C2056779%2C2056781%2C2058629%2C2059019%2C2059138"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045796%2C2046734%2C2051424%2C2054721%2C2057994%2C2058094%2C2058611%2C2058615%2C2058616%2C2061315"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2053153%2C2053262%2C2054763%2C2059198%2C2059224"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-74"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-77"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74988 (GCVE-0-2026-74988)

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

Title

Internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154

Summary

Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Severity

No CVSS data available.

Assigner

mozilla mitre root

References

7 references

URL	Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
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: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 153.1 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

Gabriele Svelto, Tom Ritter, Tom Schuster and the Mozilla Fuzzing Team

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.1",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "154",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Gabriele Svelto, Tom Ritter, Tom Schuster and the Mozilla Fuzzing Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1."
            }
          ],
          "value": "Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T18:55:47.808Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "name": "Moderate Severity internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154",
          "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2018164%2C2045404%2C2045507%2C2045711%2C2052403%2C2053174%2C2054643%2C2054667%2C2054671%2C2054674%2C2054687%2C2054717%2C2054761%2C2054787%2C2055676%2C2056779%2C2056781%2C2058629%2C2059019%2C2059138"
        },
        {
          "name": "High Severity internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154",
          "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045796%2C2046734%2C2051424%2C2054721%2C2057994%2C2058094%2C2058611%2C2058615%2C2058616%2C2061315"
        },
        {
          "name": "Low Severity internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154",
          "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2053153%2C2053262%2C2054763%2C2059198%2C2059224"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-74/"
        },
        {
          "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/mfsa2026-80/"
        }
      ],
      "title": "Internally found bugs fixed in Thunderbird ESR 153.1 and Thunderbird 154"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-74988",
    "datePublished": "2026-08-18T12:23:41.611Z",
    "dateReserved": "2026-08-17T11:59:23.074Z",
    "dateUpdated": "2026-08-18T18:55:47.808Z",
    "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

GHSA-QMCG-GF85-VJV7

CVE-2026-74988 (GCVE-0-2026-74988)

Tags

Sightings

Nomenclature