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PatchSiren cyber security CVE debrief

CVE-2026-12308 Mozilla CVE debrief

A memory safety bug was fixed in Firefox 152 and Firefox ESR 140.12. This vulnerability was published on [cvePublishedAt].

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 and Firefox ESR should update to version 152 and 140.12 respectively to mitigate this vulnerability.

Technical summary

A memory safety bug was fixed in Firefox 152 and Firefox ESR 140.12.

Defensive priority

High

Recommended defensive actions

  • Update Firefox to version 152 or later
  • Update Firefox ESR to version 140.12 or later

Evidence notes

The CVE record was obtained from [resourceLinkAnnotations:cve-org]. The vulnerability details were obtained from [resourceLinkAnnotations:nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12308 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12308

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

  • CVE-2026-12308 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12308

    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.