What’s Vulnerable › Vulnerabilities

CVE-2025-9179: Sandbox escape due to invalid pointer in the Audio/Video: GMP component

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-19 · updated 2026-10-05
• Weakness: CWE-119

Description

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Affected products

• Mozilla Firefox: before 115.27.0; before 142.0; from 128.0 before 128.14.0; from 140.0 before 140.2.0 — fixed in 115.27.0, 128.14.0, 140.2.0, 142.0
• Mozilla Thunderbird: before 128.14.0; before 142.0; from 140.0 before 140.2.0 — fixed in 128.14.0, 140.2.0, 142.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.27.0, 128.14.0, 140.2.0, 142.0; Mozilla Thunderbird 128.14.0, 140.2.0, 142.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1979527
• https://www.mozilla.org/security/advisories/mfsa2025-64/
• https://www.mozilla.org/security/advisories/mfsa2025-65/
• https://www.mozilla.org/security/advisories/mfsa2025-66/
• https://www.mozilla.org/security/advisories/mfsa2025-67/
• https://www.mozilla.org/security/advisories/mfsa2025-70/
• https://www.mozilla.org/security/advisories/mfsa2025-71/
• https://www.mozilla.org/security/advisories/mfsa2025-72/
• https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html
• https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html

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