RHSA-2026:91633

Vulnerability from csaf_redhat - Published: 2026-10-28 22:02 - Updated: 2026-11-02 11:53
Summary
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: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-92035) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832) * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784) * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794) * firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777) * firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766) * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779) * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792) * firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776) * firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757) * firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786) * firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869) * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791) * firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818) * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782) * firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772) * firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759) * firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778) * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758) * firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774) * firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785) * firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821) * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788) * firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771) * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762) * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790) * firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773) * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780) * firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767) * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756) * firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783) 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.
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CVE-2026-92035

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)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-501 - Trust Boundary Violation
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-0:140.17.0-1.el8_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-0:140.17.0-1.el8_8.src —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.17.0-1.el8_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-debuginfo-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.17.0-1.el8_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:thunderbird-debugsource-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:thunderbird-0:140.17.0-1.el8_8.src —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:thunderbird-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:thunderbird-debuginfo-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:thunderbird-debugsource-0:140.17.0-1.el8_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-96869

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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100756

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions in the Audio/Video: Playback component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100757

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Widget component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100758

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape in the DOM: Navigation component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-284 - Improper Access Control
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100759

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Uninitialized memory in the Storage: Quota Manager component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-457 - Use of Uninitialized Variable
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100762

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Content Processes component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100766

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Information disclosure in the Networking: JAR component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100767

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Networking: Cache component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100769

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript: WebAssembly component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100770

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Content Processes component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100771

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Streams component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100772

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100773

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Storage: IndexedDB component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100774

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100775

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape in the Graphics component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-693 - Protection Mechanism Failure
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100776

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the JavaScript: WebAssembly component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100777

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Graphics: Canvas2D component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100778

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100779

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the XSLT component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100780

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100781

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: WebRender component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100782

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation due to incorrect boundary conditions in the Graphics component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100783

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Uninitialized memory in the Audio/Video component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-908 - Use of Uninitialized Resource
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100784

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Layout: Text and Fonts component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100785

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100786

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the Graphics component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100788

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Invalid pointer in the JavaScript: WebAssembly component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-824 - Access of Uninitialized Pointer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100789

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Graphics: Canvas2D component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100790

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the XSLT component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100791

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100792

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: JIT miscompilation in the JavaScript: WebAssembly component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-843 - Access of Resource Using Incompatible Type
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100794

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 Internationalization component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100797

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation due to use-after-free in the Graphics: WebRender component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100801

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the DLL Services component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-269 - Improper Privilege Management
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100803

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Same-origin policy bypass in the WebExtensions component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-346 - Origin Validation Error
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100807

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the DOM: Service Workers component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-269 - Improper Privilege Management
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100811

A flaw was found in Firefox. A use-after-free memory flaw in the Document Object Model (DOM) Core and HTML component allows a remote attacker to perform a sandbox escape. By enticing a user to visit a specially crafted web page, an attacker can leverage this vulnerability to execute arbitrary code outside the browser's restricted sandbox environment.

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
CVE-2026-100818

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the Widget: Gtk component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100819

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 XPCOM component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100820

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the Address Bar component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-15 - External Control of System or Configuration Setting
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100821

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Site isolation issue in the Panning and Zooming component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-346 - Origin Validation Error
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Moderate
CVE-2026-100832

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Graphics: Canvas2D component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 11 products, the same list as for CVE-2026-92035
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:91633 self
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{
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    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "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.\n\nRed 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.",
        "title": "Topic"
      },
      {
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        "text": "Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-92035)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)\n\n* firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)\n\n* firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794)\n\n* firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)\n\n* firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)\n\n* firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)\n\n* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)\n\n* firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)\n\n* firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)\n\n* firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)\n\n* firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)\n\n* firefox: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100791)\n\n* firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818)\n\n* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782)\n\n* firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100772)\n\n* firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100778)\n\n* firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)\n\n* firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781)\n\n* firefox: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100774)\n\n* firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100785)\n\n* firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)\n\n* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)\n\n* firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)\n\n* firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100780)\n\n* firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)\n\n* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756)\n\n* firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)\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.",
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            "AppStream-8.8.0.Z.TUS:thunderbird-0:140.17.0-1.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:thunderbird-debuginfo-0:140.17.0-1.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:thunderbird-debugsource-0:140.17.0-1.el8_8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component"
    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.