PatchSiren cyber security CVE debrief
CVE-2026-12301 Mozilla CVE debrief
A memory safety bug was fixed in Firefox 152. This vulnerability was fixed in Firefox 152. The bug was reported to Mozilla via Bugzilla and addressed in the Mozilla Security Advisories.
- Vendor
- Mozilla
- Product
- Firefox
- CVSS
- MEDIUM 5.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-16
- Original CVE updated
- 2026-06-17
- Advisory published
- 2026-06-16
- Advisory updated
- 2026-06-17
Who should care
Users of Firefox, particularly those who use the browser for sensitive activities, should ensure they are running Firefox 152 or later to mitigate this vulnerability.
Technical summary
A memory safety bug was fixed in Firefox 152. The bug was reported to Mozilla via Bugzilla and addressed in the Mozilla Security Advisories.
Defensive priority
Medium
Recommended defensive actions
- Update Firefox to version 152 or later.
Evidence notes
The CVE record and NVD detail for CVE-2026-12301 indicate a memory safety bug was fixed in Firefox 152.
Official resources
CVE-2026-12301 was published on 2026-06-16T13:16:30.363Z and has not been modified since then.