Executive brief
Mozilla has released a security update for Firefox to address a memory safety vulnerability. If successfully exploited, this flaw could potentially lead to browser crashes or allow an attacker to execute unauthorized code on a user's system. Users are advised to update to the latest version of the browser to maintain the security of their data and operations.
Technical details
This advisory addresses a memory safety vulnerability (CVE-2026-12317) in Mozilla Firefox. The vulnerability is categorized as a memory safety bug, which typically involves issues such as buffer overflows, use-after-free, or other memory corruption flaws. An attacker could potentially exploit this by enticing a user to visit a specially crafted website. While the specific root cause within the codebase is not detailed in the public advisory, Mozilla indicates that such memory corruption issues can often be leveraged for arbitrary code execution. The vulnerability is resolved in Firefox 152.
Affected products
- Mozilla Firefox < 152
Timeline
- 2026-06-16: advisory: Mozilla Foundation Security Advisory 2026-57 published.
- 2026-06-16: patched: Fixed in Firefox 152.