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10.0 Critical

CVE-2025-2857 Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in…

Description

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

Affected products and versions

Product Affected versions Fixed in
Firefox 136.0 earliest → < 136.0.4 136.0.4
Firefox 128.8 earliest → < 128.8.1 128.8.1
Firefox 115.21 earliest → < 115.21.1 115.21.1
Firefox ESR 115.21 earliest → < 115.21.1 115.21.1

References

Timeline

  1. Published
  2. Last modified

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