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PatchSiren cyber security CVE debrief

CVE-2026-12324 Mozilla CVE debrief

CVE-2026-12324 is a vulnerability in the Graphics: CanvasWebGL component. The issue involves incorrect boundary conditions. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12. For more information, refer to the [CVE-2026-12324 CVE record](resourceLinkAnnotations.cve-org) and [CVE-2026-12324 NVD detail](resourceLinkAnnotations.nvd).

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 7.3
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 and Firefox ESR should update to Firefox 152 and Firefox ESR 140.12 to mitigate this vulnerability.

Technical summary

The vulnerability is caused by incorrect boundary conditions in the Graphics: CanvasWebGL component. This issue was addressed in Firefox 152 and Firefox ESR 140.12.

Defensive priority

high

Recommended defensive actions

  • Update to Firefox 152 or Firefox ESR 140.12

Evidence notes

The vendor is identified as Mozilla based on evidence from the source item.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12324 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12324

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

  • CVE-2026-12324 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12324

    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.