CVE-2026-124882

Use-after-free in the CSS Parsing and Computation component

Published Nov 10, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4896-1 firefox-esr security update
Debian DLA Debian DLA DLA-4898-1 thunderbird security update
History
Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
Redhat rhel Eus
Weaknesses CWE-825
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:rhel_eus:9.8
Vendors & Products Redhat
Redhat enterprise Linux
Redhat rhel Eus
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, and Thunderbird 160. Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.
References
Type Values Removed Values Added
Description Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7. Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, and Thunderbird 160.
References
Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Description Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
Title Use-after-free in the CSS Parsing and Computation component
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Nov 10, 2026, 8:24 PM
Reserved
Nov 9, 2026, 2:46 PM
Status
Deferred
Published
Nov 10, 2026, 2:17 PM
Modified
Nov 10, 2026, 9:19 PM
Severity
Important
Public date
Nov 10, 2026, 1:28 PM