Vulnerability · Published Sep 16, 2025 · Assigned by mozilla
CVE-2025-10528Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component
High 7.3
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.4%top 68.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 140.3.0-1.el10_0 | ALSA-2025:16109 |
| AlmaLinux:8 | firefox | 140.3.0-1.el8_10.alma.1 | ALSA-2025:16260 |
| AlmaLinux:9 | firefox | 140.3.0-1.el9_6.alma.1 | ALSA-2025:16108 |
| AlmaLinux:9 | firefox-x11 | 140.3.0-1.el9_6.alma.1 | ALSA-2025:16108 |
| AlmaLinux:10 | thunderbird | 140.3.0-1.el10_0.alma.1 | ALSA-2025:16157 |
| AlmaLinux:8 | thunderbird | 140.3.0-1.el8_10.alma.1 | ALSA-2025:16589 |
| AlmaLinux:9 | thunderbird | 140.3.0-1.el9_6.alma.1 | ALSA-2025:16156 |
| Debian:12 | firefox-esr | 140.3.0esr-1~deb12u1 | DEBIAN-CVE-2025-10528 |
| Debian:12 | firefox-esr | 140.3.0esr-1~deb12u1 | DSA-6003-1 |
| Debian:13 | firefox-esr | 140.3.0esr-1~deb13u1 | DEBIAN-CVE-2025-10528 |
| Debian:13 | firefox-esr | 140.3.0esr-1~deb13u1 | DSA-6003-1 |
| Debian:14 | firefox-esr | 140.3.0esr-1 | DEBIAN-CVE-2025-10528 |
| Debian:12 | thunderbird | 1:140.3.0esr-1~deb12u1 | DSA-6011-1 |
| Debian:12 | thunderbird | 1:140.3.0esr-1~deb12u1 | DEBIAN-CVE-2025-10528 |
| Debian:13 | thunderbird | 1:140.3.0esr-1~deb13u1 | DEBIAN-CVE-2025-10528 |
| Debian:13 | thunderbird | 1:140.3.0esr-1~deb13u1 | DSA-6011-1 |
| Debian:14 | thunderbird | 1:140.3.0esr-1 | DEBIAN-CVE-2025-10528 |
| Rocky Linux:10 | firefox | 0:140.3.0-1.el10_0 | RLSA-2025:16109 |
| Rocky Linux:8 | firefox | 0:140.3.0-1.el8_10 | RLSA-2025:16260 |
| Rocky Linux:9 | firefox | 0:140.3.0-1.el9_6 | RLSA-2025:16108 |
| Rocky Linux:10 | thunderbird | 0:140.3.0-1.el10_0 | RLSA-2025:16157 |
| Rocky Linux:8 | thunderbird | 0:140.3.0-1.el8_10 | RLSA-2025:16589 |
| Rocky Linux:9 | thunderbird | 0:140.3.0-1.el9_6 | RLSA-2025:16156 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-10528 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-10528 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-10528 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-10528 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-10528 |
| Ubuntu:22.04:LTS | thunderbird | 1:140.7.1+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-10528 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1986185
- https://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/msg00026.html
- https://lists.debian.org/debian-lts-announce/2025/09/msg00020.html