PatchSiren cyber security CVE debrief
CVE-2026-12300 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 [ref-4]. For more information, refer to Mozilla's security advisory [ref-5].
- 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 152 and earlier versions should update to Firefox 152 or later to address this vulnerability.
Technical summary
A memory safety bug was fixed in Firefox 152.
Defensive priority
High
Recommended defensive actions
- Update to Firefox 152 or later
Evidence notes
The CVE record [cve-org] and NVD detail [nvd] provide additional information on this vulnerability.
Official resources
CVE-2026-12300 was published on 2026-06-16T13:16:30.267Z and has not been modified since then.