RHSA-2026:1462
Vulnerability from csaf_redhat - Published: 2026-01-28 04:22 - Updated: 2026-03-18 17:26Summary
Red Hat Security Advisory: thunderbird security update
Severity
Important
Notes
Topic: An update for thunderbird is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Mozilla Thunderbird is a standalone mail and newsgroup client.
Security Fix(es):
* firefox: Spoofing issue in the Downloads Panel component (CVE-2025-14327)
* firefox: Use-after-free in the JavaScript: GC component (CVE-2026-0885)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 (CVE-2026-0891)
* firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-0878)
* firefox: Use-after-free in the IPC component (CVE-2026-0882)
* firefox: Use-after-free in the JavaScript Engine component (CVE-2026-0884)
* firefox: Information disclosure in the Networking component (CVE-2026-0883)
* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-0877)
* firefox: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-0890)
* firefox: Clickjacking issue, information disclosure in the PDF Viewer component (CVE-2026-0887)
* firefox: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-0879)
* firefox: Sandbox escape due to integer overflow in the Graphics component (CVE-2026-0880)
* firefox: Incorrect boundary conditions in the Graphics component (CVE-2026-0886)
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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Spoofing issue in the Downloads Panel component
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the DOM: Security component
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Graphics component
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to integer overflow in the Graphics component
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the IPC component
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Information disclosure in the Networking component
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript Engine component
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript: GC component
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions in the Graphics component
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Clickjacking issue, information disclosure in the PDF Viewer component
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
7.5 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:1462
References
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-0891",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0891"
},
{
"category": "external",
"summary": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0891",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0891"
},
{
"category": "external",
"summary": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0891",
"url": "https://www.mozilla.org/security/advisories/mfsa2026-05/#CVE-2026-0891"
}
],
"release_date": "2026-01-13T13:30:59.454000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-28T04:22:41+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.src",
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-0:140.7.0-1.el8_8.src",
"AppStream-8.8.0.Z.TUS:thunderbird-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-debuginfo-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-debugsource-0:140.7.0-1.el8_8.x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:1462"
}
],
"scores": [
{
"cvss_v3": {
"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"
},
"products": [
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.src",
"AppStream-8.8.0.Z.E4S:thunderbird-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.7.0-1.el8_8.ppc64le",
"AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-0:140.7.0-1.el8_8.src",
"AppStream-8.8.0.Z.TUS:thunderbird-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-debuginfo-0:140.7.0-1.el8_8.x86_64",
"AppStream-8.8.0.Z.TUS:thunderbird-debugsource-0:140.7.0-1.el8_8.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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