Low severity · published Oct 8, 2026
CVE-2026-88648
Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized…
3.7
CVSS
0.2%
EPSS
No
On KEV
Description
Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88648
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88648
www.rfc-editor.org
https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.10
www.rfc-editor.org
https://www.rfc-editor.org/rfc/rfc5280#section-6.1.4
gist.github.com
https://gist.github.com/lkloliver/1f2a97cb8d0b31aa27b6bd0354358d7d