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PatchSiren cyber security CVE debrief

CVE-2026-12330 Mozilla CVE debrief

CVE-2026-12330 is a vulnerability in the Internationalization component due to incorrect boundary conditions. This issue was addressed in Firefox ESR 140.12 and Firefox ESR 115.37.

Vendor
Mozilla
Product
Firefox
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Users of Firefox ESR 140.12 and Firefox ESR 115.37 may be affected by this vulnerability.

Technical summary

The vulnerability is caused by incorrect boundary conditions in the Internationalization component.

Defensive priority

high

Recommended defensive actions

  • Update to Firefox ESR 140.12 or Firefox ESR 115.37

Evidence notes

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

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12330 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12330

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

  • CVE-2026-12330 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12330

    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.