Description
A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.
Affected products
gnu: gnutls; redhat: openshift container platform; redhat: enterprise linux
References10
- access.redhat.com/errata/RHSA-2026:13274 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-33845 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2450624 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:13274 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-33845 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2450624 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:20611
- access.redhat.com/errata/RHSA-2026:20612
- access.redhat.com/errata/RHSA-2026:20613
- access.redhat.com/errata/RHSA-2026:26319
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - EPSS — exploit probability
- 2% percentile: 82 · as of 13 November 2026
- CWE
- CWE-191
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.