CVE-2025-10527
published 2025-09-16CVE-2025-10527: Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and…
PriorityP430high7.1CVSS 3.1
AVNACLPRNUIRSCCLILAL
EPSS
0.28%
19.9th percentile
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 143.0-1 (sid) | firefox 143.0-1 (sid) |
| debian | firefox-esr | < firefox 143.0-1 (sid) | firefox 143.0-1 (sid) |
| debian | thunderbird | < firefox 143.0-1 (sid) | firefox 143.0-1 (sid) |
| mozilla | firefox | < 140.3.0 | 140.3.0 |
| mozilla | firefox | <= 143.0 | — |
| mozilla | firefox | — | — |
| mozilla | thunderbird | < 140.3.0 | 140.3.0 |
| mozilla | thunderbird | >= 0 < 1:140.3.0esr-1~deb11u1 | 1:140.3.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:140.3.0esr-1~deb12u1 | 1:140.3.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:140.3.0esr-1~deb13u1 | 1:140.3.0esr-1~deb13u1 |
| mozilla | thunderbird | >= 0 < 1:140.3.0esr-1 | 1:140.3.0esr-1 |
| mozilla | thunderbird | >= 141.0 < 143.0 | 143.0 |
CVSS provenance
nvdv3.17.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
osv7.1HIGH
vendor_debian7.1HIGH
vendor_redhat7.1HIGH
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Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
vendor_redhat·2025-09-16·CVSS 7.1
CVE-2025-10527 [HIGH] CWE-416 firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
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 Graphics.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Debian
CVE-2025-10527: firefox - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This v...
vendor_debian·2025·CVSS 7.1
CVE-2025-10527 [HIGH] CVE-2025-10527: firefox - Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This v...
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
Scope: local
sid: resolved (fixed in 143.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-78: CVE-2025-10527
vendor_mozilla·CVSS 7.1
CVE-2025-10527 [HIGH] Mozilla Foundation Security Advisory 2025-78: CVE-2025-10527
Mozilla Foundation Security Advisory 2025-78
CVE: CVE-2025-10527
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.3
Mozilla
Mozilla Foundation Security Advisory 2025-75: CVE-2025-10527
vendor_mozilla·CVSS 7.1
CVE-2025-10527 [HIGH] Mozilla Foundation Security Advisory 2025-75: CVE-2025-10527
Mozilla Foundation Security Advisory 2025-75
CVE: CVE-2025-10527
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.3
Mozilla
Mozilla Foundation Security Advisory 2025-77: CVE-2025-10527
vendor_mozilla·CVSS 7.1
CVE-2025-10527 [HIGH] Mozilla Foundation Security Advisory 2025-77: CVE-2025-10527
Mozilla Foundation Security Advisory 2025-77
CVE: CVE-2025-10527
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 143
Mozilla
Mozilla Foundation Security Advisory 2025-73: CVE-2025-10527
vendor_mozilla·CVSS 7.1
CVE-2025-10527 [HIGH] Mozilla Foundation Security Advisory 2025-73: CVE-2025-10527
Mozilla Foundation Security Advisory 2025-73
CVE: CVE-2025-10527
Product: Firefox
Impact: high
Fixed in: Firefox 143
OSV
CVE-2025-10527: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
osv·2025-09-16·CVSS 7.1
CVE-2025-10527 [HIGH] CVE-2025-10527: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
GHSA
GHSA-5vxr-wr7m-x3p3: This vulnerability affects Firefox < 143, Firefox ESR < 140
ghsa_unreviewed·2025-09-16
CVE-2025-10527 [HIGH] CWE-416 GHSA-5vxr-wr7m-x3p3: This vulnerability affects Firefox < 143, Firefox ESR < 140
This vulnerability affects Firefox < 143, Firefox ESR < 140.3, Thunderbird < 143, and Thunderbird < 140.3.
No detection rules found.
No public exploits indexed.
Bugzilla
Heap use-after-free / double-delete in [@ SharedContextWebgl::ClearSnapshotPBOs] via refcount resurrection during ~SharedContextWebgl, driven by canvas event ring buffer
bugzilla·2026-06-05
CVE-2025-10527 Heap use-after-free / double-delete in [@ SharedContextWebgl::ClearSnapshotPBOs] via refcount resurrection during ~SharedContextWebgl, driven by canvas event ring buffer
Heap use-after-free / double-delete in [@ SharedContextWebgl::ClearSnapshotPBOs] via refcount resurrection during ~SharedContextWebgl, driven by canvas event ring buffer
mozilla::gfx::SharedContextWebgl - the WebGL context shared by all remote-canvas (Accelerated Canvas2D) translators in the GPU/parent process - is both RefCounted and SupportsWeakPtr. Its destructor (dom/canvas/DrawTargetWebgl.cpp:219-243) ends with ClearSnapshotPBOs(), which pops any snapshot surfaces with pending PBO readbacks from mSnapshotPBOs and calls SourceSurfaceWebgl::ForceReadFromPBO() -> EnsureData() (dom/canvas/SourceSurfaceWebgl.cpp:53-63). EnsureData promotes the surface's WeakPtr to a RefPtr at line 55. Because mozilla::WeakPtr is only detached in ~SupportsWeakPtr (which runs after the derived destructor bo
Bugzilla
CVE-2025-10527 firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
bugzilla·2025-09-16·CVSS 7.1
CVE-2025-10527 [HIGH] CVE-2025-10527 firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
CVE-2025-10527 firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
This vulnerability affects Firefox < 143 and Firefox ESR < 140.3.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10
Via RHSA-2025:16109 https://access.redhat.com/errata/RHSA-2025:16109
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2025:16108 https://access.redhat.com/errata/RHSA-2025:16108
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2025:16156 https://access.redhat.com/errata/RHSA-2025:16156
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10
Via RHSA-2025:16157 https://access.red
https://bugzilla.mozilla.org/show_bug.cgi?id=1984825https://www.mozilla.org/security/advisories/mfsa2025-73/https://www.mozilla.org/security/advisories/mfsa2025-75/https://www.mozilla.org/security/advisories/mfsa2025-77/https://www.mozilla.org/security/advisories/mfsa2025-78/https://lists.debian.org/debian-lts-announce/2025/09/msg00020.htmlhttps://lists.debian.org/debian-lts-announce/2025/09/msg00026.html
2025-09-16
Published