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

EPSS: 0.011 (62.3th percentile) — read the EPSS interpretation.

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.

Affected products

Gnu Libtasn1 — versions 4.20.0
Gnutls Libtasn1 — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cret@cert.org (Product)
cret@cert.org (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.