CVE-2026-92061: mozilla firefox

Vulnerability summary

CVE-2026-92061 is a critical (CVSS 9.8) vulnerability in mozilla firefox. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.3% of scored vulnerabilities.

Timeline

1. 15-09-2026
   PublishedVulnerability first disclosed.
2. 21-09-2026
   Last modifiedVulnerability information updated.

Description

Incorrect boundary conditions in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.