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PatchSiren cyber security CVE debrief

CVE-2026-12329 Mozilla CVE debrief

A memory safety bug was fixed in Firefox ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12. The bug was reported via [ref-4](resourceLinkAnnotations.ref-4) and [ref-5](resourceLinkAnnotations.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
2026-07-15
Advisory published
2026-06-16
Advisory updated
2026-07-15

Who should care

Users of Firefox ESR 140.12

Technical summary

Memory safety bug fixed in Firefox ESR 140.12

Defensive priority

Medium

Recommended defensive actions

  • Update to Firefox ESR 140.12 or later

Evidence notes

The CVE was published on 2026-06-16T13:16:33.657Z and last modified on 2026-06-16T13:16:33.657Z. The vendor is likely Mozilla, based on [evidence-0].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12329 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12329

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

  • CVE-2026-12329 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12329

    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.