Executive brief
Mozilla has released security updates for Firefox to address a high-severity vulnerability in its graphics component. This flaw involves incorrect boundary conditions, which could potentially allow an attacker to disrupt the browser's operations or compromise user data when processing malicious web content. Users are advised to update to the latest versions of Firefox or Firefox ESR to mitigate this risk.
Technical details
A vulnerability exists in the Graphics component of Mozilla Firefox due to incorrect boundary conditions. While specific technical details are restricted in the associated Bugzilla report (Bug 2053326), this class of vulnerability typically involves out-of-bounds reads or writes during the processing of graphical data. An attacker could exploit this by enticing a user to visit a malicious website, potentially leading to memory corruption or arbitrary code execution within the context of the browser process. The issue is resolved in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.
Affected products
- Mozilla Firefox < 153
- Mozilla Firefox ESR < 115.38, < 140.13
Timeline
- 2026-07-21: advisory: Mozilla Foundation Security Advisories MFSA2026-68, MFSA2026-69, and MFSA2026-70 published.
- 2026-07-21: patched