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CVE-2026-12326 Mozilla CVE debrief

A series of memory safety bugs were discovered in Firefox 151 and Thunderbird 151. Some of these bugs demonstrated evidence of memory corruption. While the exact impact of these vulnerabilities is unclear, it is presumed that, with sufficient effort, an attacker could potentially exploit them to execute arbitrary code.

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 8.1
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 151 and Thunderbird 151 are potentially affected by these vulnerabilities.

Technical summary

The CVE-2026-12326 entry details multiple memory safety bugs found in Firefox 151 and Thunderbird 151. These bugs could potentially be exploited to run arbitrary code, although the exact impact is not specified.

Defensive priority

High

Recommended defensive actions

  • Users should update to Firefox 152, which addresses these vulnerabilities.

Evidence notes

The CVE and associated sources indicate that these vulnerabilities were addressed in Firefox 152.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12326 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12326

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

  • CVE-2026-12326 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12326

    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.