What is CVE-2025-13151?

CVE-2025-13151 is a high-severity vulnerability in GNU Libtasn1, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-01-07.

How severe is CVE-2025-13151?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in GNU Libtasn1

CVE-2025-13151

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.

Vulnerability class: Buffer Overflow

Published 2026-01-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.011 · change: -0.000

Affected products

GNU Libtasn1 — versions 4.20.0
Gnutls Libtasn1 — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

gitlab.com/gnutls/libtasn1 (Product)
gitlab.com/gnutls/libtasn1/-/merge_requests/121 (Patch, patch)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Patch)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2025-13151?: CVE-2025-13151 is a high-severity vulnerability in GNU Libtasn1, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-01-07.
How severe is CVE-2025-13151?: High severity. CVSS v3 base score is 7.5 out of 10.