CVE-2025-49709

CRITICAL

Firefox < 139.0.4 - Out-of-bounds Write via Canvas Operations

Title source: llm

Certain canvas operations could have lead to memory corruption. This vulnerability was fixed in Firefox 139.0.4.

Core 2

Core References

Permissions Required

Vendor Advisory

CVSS v3 9.8

EPSS 0.0041

EPSS Percentile 61.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

CWE

CWE-787

Status published

Products (2)

mozilla/firefox < 139.0.4

Mozilla/Firefox 139.0.4

Published Jun 11, 2025

Tracked Since Feb 18, 2026