CVE-2025-12380: Use-after-free in WebGPU internals triggered from a compromised child process

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-28 · updated 2026-10-08
Weakness: CWE-416

Description

Starting with Firefox 142, it was possible for a compromised child process to trigger a use-after-free in the GPU or browser process using WebGPU-related IPC calls. This may have been usable to escape the child process sandbox. This vulnerability was fixed in Firefox 144.0.2.

Affected products

Mozilla Firefox: from 142.0 before 144.0.2 — fixed in 144.0.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 144.0.2. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1993113
https://www.mozilla.org/security/advisories/mfsa2025-86/

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