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Vulnerability · Published Oct 8, 2026 · Assigned by mitre

CVE-2026-88647

Medium 6.5

In plain English

A medium-severity security flaw in the gnutls28 package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 84.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12gnutls28no fix listedDEBIAN-CVE-2026-88647
Debian:13gnutls28no fix listedDEBIAN-CVE-2026-88647
Debian:14gnutls28no fix listedDEBIAN-CVE-2026-88647
Ubuntu:22.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88647
Ubuntu:24.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88647
Ubuntu:26.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88647
Ubuntu:26.10gnutls28no fix listedUBUNTU-CVE-2026-88647

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-297 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

References