Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Published: 2026-10-27
Score: n/a
EPSS: n/a
KEV: No
Impact: Remote Code Execution via memory corruption
Action: Immediate Patch
AI Analysis

Impact

Use‑after‑free in Mozilla Firefox’s DOM core and HTML component allows a malformed or malicious web page to read or write memory that has already been freed. This memory corruption can change program state, potentially enabling arbitrary code execution or causing a denial of service.

Affected Systems

The vulnerability affects all Mozilla Firefox releases older than version 159, and any ESR branches released before ESR 115.44 and ESR 153.6. Users running those earlier versions are exposed and must update before the bug is fixed.

Risk and Exploitability

The CVE has no EPSS score and is not listed in CISA’s KEV catalog. Use‑after‑free bugs are known to provide reasonable remote exploitation vectors. The likely vector is a crafted web page or script that triggers the bug while browsing. Given the high impact of arbitrary code execution and the absence of early exploit data, the risk remains significant and warrants immediate patching.

Generated by OpenCVE AI on October 27, 2026 at 18:03 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Mozilla Firefox to version 159 or later, or ESR 115.44 or ESR 153.6, which contain the fix.
  • Disable or remove any third‑party extensions that modify the browser’s internal DOM behavior, as they can increase the attack surface.
  • Implement network or browser‑level filtering to restrict access to untrusted or malicious content, thereby reducing the likelihood that a crafted page reaches the vulnerable browser.

Generated by OpenCVE AI on October 27, 2026 at 18:03 UTC.

Tracking

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Advisories

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History

Tue, 27 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 27 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
Description Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, and Thunderbird 159. Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
References

Tue, 27 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6. Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, and Thunderbird 159.
Weaknesses CWE-416
References

Tue, 27 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
Title Use-after-free in the DOM: Core & HTML component
References

Subscriptions

Mozilla Firefox
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-27T18:28:39.180Z

Reserved: 2026-10-27T14:05:17.378Z

Link: CVE-2026-117901

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-27T14:16:45.540

Modified: 2026-10-27T19:17:15.363

Link: CVE-2026-117901

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T20:00:11Z

Weaknesses