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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
2026-06-18
Advisory published
2026-06-16
Advisory updated
2026-06-18

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12301 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12301

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12301 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12301

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.