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CVE-2026-7322 Mozilla CVE debrief

CVE-2026-7322 is a high-severity vulnerability affecting Thunderbird ESR 140.10.0, Thunderbird 150.0.0, and other Mozilla products. The vulnerability involves memory safety bugs that could lead to memory corruption and potentially allow attackers to execute arbitrary code. The issue was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1. This vulnerability has a CVSS score of 7.3 and is classified as HIGH.

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-28
Original CVE updated
2026-07-15
Advisory published
2026-04-28
Advisory updated
2026-07-15

Who should care

Organizations and individuals using Thunderbird ESR, Thunderbird, Firefox, and Firefox ESR should prioritize patching this vulnerability. The vulnerability's high severity and potential for arbitrary code execution make it a critical concern for defenders.

Technical summary

CVE-2026-7322 is caused by multiple memory safety bugs in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. These bugs could lead to memory corruption, and with sufficient effort, potentially allow attackers to execute arbitrary code. The vulnerability affects multiple products, including Thunderbird ESR, Thunderbird, Firefox ESR, and Firefox. Fixes are available in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

Defensive priority

Defenders should prioritize patching CVE-2026-7322 due to its high severity and potential for arbitrary code execution. Immediate action is necessary to protect against potential exploitation.

Recommended defensive actions

  • Apply patches: Update Thunderbird ESR, Thunderbird, Firefox ESR, and Firefox to the latest patched versions.
  • Inventory management: Ensure all instances of affected products are identified and prioritized for patching.
  • Monitoring: Enhance monitoring for potential exploitation attempts.
  • Exception tracking: Identify and track exceptions for any compensating controls.
  • Vendor remediation workflow: Engage with Mozilla and other affected vendors for remediation guidance.

Evidence notes

The CVE record and NVD detail provide official information on CVE-2026-7322. Mozilla's security advisories (MFSA 2026-35 to MFSA 2026-39) offer detailed mitigation and patch information. Red Hat errata provide additional context for affected systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7322 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7322

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

  • CVE-2026-7322 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7322

    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.