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CVE-2026-109735 Mozilla CVE debrief

Mozilla Firefox users should assess exposure to CVE-2026-109735, a use-after-free vulnerability in the DOM: Animation component. Defenders should verify if their deployments use affected Firefox versions and prioritize patching to prevent potential crashes or code execution. The vulnerability was fixed in Firefox 158. Evidence is limited, and further verification is required to determine the full scope of impact and exploitation.

Vendor
Mozilla
Product
Firefox
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Mozilla Firefox users, particularly those in deployment contexts where the browser is used extensively, should assess exposure to CVE-2026-109735 and prioritize patching to prevent potential crashes or code execution.

Why it matters

CVE-2026-109735 is a use-after-free vulnerability in the DOM: Animation component of Mozilla Firefox, which could lead to potential crashes or code execution. Defenders should verify Firefox versions in use and prioritize patching to version 158 or later. Evidence is limited, and further verification is required to determine the full scope of impact and exploitation.

  • Potential crashes or browser instability
  • Possible code execution or security bypass
  • Verification of Firefox version and patching required
  • Monitoring for potential anomalies or crashes

Technical summary

A use-after-free vulnerability exists in the DOM: Animation component of Mozilla Firefox. The vulnerability was fixed in Firefox 158. This issue could lead to potential crashes or code execution if exploited. Defenders should verify Firefox versions in use and prioritize patching to version 158 or later. Evidence is limited, and further verification is required to determine the full scope of impact and exploitation.

Defensive priority

Patching Firefox to version 158 or later is recommended to address the vulnerability.

Recommended defensive actions

  • Patch Firefox to version 158 or later
  • Verify Firefox version in use
  • Monitor for potential crashes or anomalies

Evidence notes

The CVE record and source item provide limited information about the vulnerability, and further verification is required to determine the full scope of impact and exploitation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-109735 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-109735

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

  • CVE-2026-109735 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-109735

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Use-after-free in the DOM: Animation component

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/109xxx/CVE-2026-109735.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://www.mozilla.org/security/advisories/mfsa2026-106/

    Supplemental source

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.