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Vulnerability · Published Oct 8, 2026 · Assigned by mitre

CVE-2026-88648

Low 3.7

In plain English

A low-severity improper certificate validation 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 10% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.2%top 89.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In GnuTLS v3.8.13, an excluded msUPN/SRV otherName is never checked. 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-2026-88648
Debian:13gnutls28no fix listedDEBIAN-CVE-2026-88648
Debian:14gnutls28no fix listedDEBIAN-CVE-2026-88648
Ubuntu:22.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88648
Ubuntu:24.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88648
Ubuntu:26.04:LTSgnutls28no fix listedUBUNTU-CVE-2026-88648
Ubuntu:26.10gnutls28no fix listedUBUNTU-CVE-2026-88648

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References