Description
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.
Affected products
gnu: gnutls; redhat: hardened images; redhat: openshift container platform; redhat: enterprise linux
References10
- gitlab.com/gnutls/gnutls/-/issues/1801 ExploitIssue TrackingVendor Advisory
- gitlab.com/gnutls/gnutls/-/issues/1801 ExploitIssue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:13274 Third Party Advisory
- access.redhat.com/errata/RHSA-2026:20612
- access.redhat.com/errata/RHSA-2026:20613
- access.redhat.com/errata/RHSA-2026:26319
- access.redhat.com/errata/RHSA-2026:26409
- access.redhat.com/errata/RHSA-2026:29197
- access.redhat.com/errata/RHSA-2026:58981
- access.redhat.com/errata/RHSA-2026:72502
Metrics
- CVSS 3.1
-
3.7
LOW
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N - EPSS — exploit probability
- 1% percentile: 57 · as of 13 November 2026
- CWE
- CWE-179
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.