High severity · published Jan 7, 2026
CVE-2025-13151
No description published yet
7.5
CVSS
1.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libtasn1 · GnuTLS
through 4.20.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-13151
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-13151
Product
https://gitlab.com/gnutls/libtasn1
Patch
https://gitlab.com/gnutls/libtasn1/-/merge_requests/121
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/08/5
Third Party Advisory
https://www.kb.cert.org/vuls/id/271649