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PatchSiren cyber security CVE debrief

CVE-2026-12297 Mozilla CVE debrief

A sandbox escape vulnerability was discovered in the Networking component of Firefox, caused by incorrect boundary conditions. This issue was addressed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Vendor
Mozilla
Product
Firefox
CVSS
CRITICAL 9.6
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, Firefox ESR 140.12, and Firefox ESR 115.37 may be affected by this vulnerability.

Technical summary

The vulnerability, identified as CVE-2026-12297, allows for a sandbox escape due to incorrect boundary conditions in the Networking component.

Defensive priority

High

Recommended defensive actions

  • Update to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37 to address the vulnerability.

Evidence notes

The CVE record [cve-org] and NVD detail [nvd] provide official information about the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12297 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12297

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

  • CVE-2026-12297 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12297

    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.