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CVE-2026-12328 Mozilla CVE debrief

Memory safety bugs were present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. Some of these bugs showed evidence of memory corruption, and it is presumed that with enough effort, some of these could have been exploited to run arbitrary code. The vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

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 ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151 should update to the latest versions to mitigate the risk of potential code execution.

Technical summary

The vulnerability involves multiple memory safety bugs. While the exact details are not provided, it is known that some of these bugs could lead to memory corruption.

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 and references from Mozilla provide evidence of the vulnerability and its fixes.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12328 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12328

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

  • CVE-2026-12328 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12328

    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.