CVE-2025-13151

Publication date 8 January 2026

Last updated 12 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libtasn1-6	25.10 questing	Fixed 4.20.0-2ubuntu0.25.10.1
	25.04 plucky	Fixed 4.20.0-2ubuntu0.25.04.1
	24.04 LTS noble	Fixed 4.19.0-3ubuntu0.24.04.2
	22.04 LTS jammy	Fixed 4.18.0-4ubuntu0.2
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libtasn1-6	Upstream: d276cc4

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7954-1
Libtasn1 vulnerabilities
12 January 2026