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PatchSiren cyber security CVE debrief

CVE-2026-12318 Mozilla CVE debrief

CVE-2026-12318 is a vulnerability in the Libraries component in NSS. The issue is related to incorrect boundary conditions. This vulnerability was fixed in Firefox 152.

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 systems that utilize NSS for cryptographic operations should be aware of this vulnerability.

Technical summary

The vulnerability is caused by incorrect boundary conditions in the Libraries component in NSS. This issue has been addressed in Firefox 152.

Defensive priority

medium

Recommended defensive actions

  • Update Firefox to version 152 or later to ensure the vulnerability is patched.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. References from Mozilla's bugzilla and security advisories offer additional context.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12318 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12318

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

  • CVE-2026-12318 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12318

    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.