Home/CVE/Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resultin
CVE

CVE-2025-13151

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

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.

HIGH · CVSS 7.5 EPSS 0.0008
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

1
gnu libtasn1all versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cret@cert.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Jan 2026 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

13
suse-csafopenSUSE-SU-2026:20470-1
suse-csafSUSE-SU-2026:21001-1
suse-csafSUSE-SU-2026:21142-1
usnUSN-7954-2
suse-csafSUSE-SU-2026:0224-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://gitlab.com/gnutls/libtasn1Product
https://gitlab.com/gnutls/libtasn1/-/merge_requests/121Patch
http://www.openwall.com/lists/oss-security/2026/01/08/5Mailing ListPatch
https://www.kb.cert.org/vuls/id/271649Third Party Advisory
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