CVE-2026-0891

HIGH
2026-01-13 [email protected]
8.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch Released
Apr 09, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 14:16 nvd
HIGH 8.1

Tags

Memory Corruption Thunderbird Firefox Redhat Suse

Description

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

Analysis

Arbitrary code execution in Firefox and Thunderbird versions prior to 147/140.7 results from memory corruption vulnerabilities that could allow remote attackers to execute malicious code with no user interaction required. Multiple memory safety flaws across Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146, and Thunderbird 146 create conditions for potential exploitation despite no patch currently being available. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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Priority Score

41
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +40
POC: 0

Vendor Status

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CVE-2026-0891 vulnerability details – vuln.today
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