Description
Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Published: 2026-10-27
Score: n/a
EPSS: n/a
KEV: No
Impact: Memory corruption risk in CSS processing
Action: Immediate Patch
AI Analysis

Impact

The vulnerability arises from incorrect boundary checks within Firefox's CSS Transitions and Animations component. A maliciously crafted CSS transition could lead to memory corruption, resulting in undefined behavior such as crashes.

Affected Systems

This flaw affects users of Mozilla Firefox. The fault was corrected in Firefox 159 and in the Firefox ESR 153.6 branch; all earlier releases remain vulnerable.

Risk and Exploitability

The CVSS score is not provided and no EPSS data is available, so precise severity and exploitation likelihood cannot be quantified. The vulnerability is not listed in CISA's KEV catalog, and the attack vector and conditions are not documented, leaving its exploit potential uncertain.

Generated by OpenCVE AI on October 27, 2026 at 16:36 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Firefox to version 159 or later, or to ESR 153.6 or later, to apply the official fix.
  • If an upgrade is not possible, consider using an alternative browser or disabling CSS transitions and animations through extensions that block animation features.
  • Continuously monitor Mozilla security advisories for additional updates or work‑arounds.

Generated by OpenCVE AI on October 27, 2026 at 16:36 UTC.

Tracking

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Advisories

No advisories yet.

History

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

Type Values Removed Values Added
Description Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, and Thunderbird 159. Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, 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 Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6. Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, and Thunderbird 159.
References

Tue, 27 Oct 2026 17:15:00 +0000

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

Tue, 27 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119

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

Type Values Removed Values Added
Description Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.
Title Incorrect boundary conditions in the CSS Transitions and Animations component
References

Subscriptions

Mozilla Firefox
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-27T18:30:31.194Z

Reserved: 2026-10-27T14:05:56.855Z

Link: CVE-2026-118004

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-27T14:16:58.200

Modified: 2026-10-27T19:17:26.183

Link: CVE-2026-118004

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T17:00:06Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer