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CVE-2026-88647 Details

Description

GnuTLS v3.8.13 can perhaps unexpectedly trust a certificate on the basis of Common Name when Subject Alternative Name has an SRV otherName (1.3.6.1.5.5.7.8.7) whose value is an OCTET STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/lkloliver/poc/tree/main/CVE-2026-88647	CVE
https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642	[email protected]
https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md	[email protected]
https://gitlab.com/gnutls/gnutls/-/issues/1802	[email protected]
https://gitlab.com/gnutls/gnutls/-/work_items/1965	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-297	Improper Validation of Certificate with Host Mismatch	CISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

6 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CVE
Nov 4, 2026	CVE Modified	[email protected]
Oct 19, 2026	CVE Modified	CISA-ADP
Oct 19, 2026	CVE Modified	CISA-ADP
Oct 10, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	New CVE Received	[email protected]