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CVE-2026-16362 Mozilla CVE debrief

CVE-2026-16362 is a high-severity use-after-free vulnerability in the WebRTC: Audio/Video component of Firefox, Firefox ESR, and Thunderbird. This type of vulnerability occurs when a program attempts to access memory after it has been freed, which can lead to crashes, data corruption, or potentially allow attackers to execute arbitrary code. The vulnerability was addressed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. Users should update to the latest versions to mitigate the risk. Affected product deployments should be reviewed for exposure, and owners should be assigned for follow-up. The CVE record was published on 2026-07-21T13:17:04.733Z and was last modified on 2026-07-22T20:16:52.103Z.

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

Who should care

Users of Firefox, Firefox ESR, Thunderbird, and other products that utilize the WebRTC: Audio/Video component should be aware of this vulnerability and take steps to update their software. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and take necessary actions to mitigate the risk.

Technical summary

The CVE-2026-16362 vulnerability is a use-after-free issue in the WebRTC: Audio/Video component of Firefox, Firefox ESR, and Thunderbird. This type of vulnerability occurs when a program attempts to access memory after it has been freed, which can lead to crashes, data corruption, or potentially allow attackers to execute arbitrary code. The vulnerability was addressed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. Affected product deployments should be reviewed for exposure.

Defensive priority

High

Recommended defensive actions

  • Update Firefox to version 153 or later
  • Update Firefox ESR to version 140.13 or later
  • Update Thunderbird to version 153 or later
  • Update Thunderbird to version 140.13 or later
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record was published on 2026-07-21T13:17:04.733Z and was last modified on 2026-07-22T20:16:52.103Z. The NVD entry is currently Undergoing Analysis. References include bug reports and security advisories from Mozilla. The vulnerability affects Firefox, Firefox ESR, and Thunderbird products that utilize the WebRTC: Audio/Video component. Defenders should verify the affected scope and review context. Additional review of related security advisories and bug reports is recommended.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-16362 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-16362

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

  • CVE-2026-16362 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-16362

    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.