CVE-2026-33845

HIGH

Gnutls: gnutls: denial of service via dtls zero-length fragment

Title source: cna

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.

References (20)

Core 20

Core References

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:20612

https://access.redhat.com/errata/RHSA-2026:20612

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2026:20613

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:29197

https://access.redhat.com/errata/RHSA-2026:29197

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30004

https://access.redhat.com/errata/RHSA-2026:30004

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30849

https://access.redhat.com/errata/RHSA-2026:30849

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30850

https://access.redhat.com/errata/RHSA-2026:30850

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:32962

https://access.redhat.com/errata/RHSA-2026:32962

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:33125

https://access.redhat.com/errata/RHSA-2026:33125

Vendor Advisory

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33845.json

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:34372

https://access.redhat.com/errata/RHSA-2026:34372

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:36005

https://access.redhat.com/errata/RHSA-2026:36005

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:36006

https://access.redhat.com/errata/RHSA-2026:36006

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:36004

https://access.redhat.com/errata/RHSA-2026:36004

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:13274

https://access.redhat.com/errata/RHSA-2026:13274

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-33845

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2450624

https://bugzilla.redhat.com/show_bug.cgi?id=2450624

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:20611

https://access.redhat.com/errata/RHSA-2026:20611

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:26319

https://access.redhat.com/errata/RHSA-2026:26319

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:26409

https://access.redhat.com/errata/RHSA-2026:26409

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:41921

https://access.redhat.com/errata/RHSA-2026:41921

Scores

CVSS v3 7.5

EPSS 0.0080

EPSS Percentile 53.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-191

Status published

Products (44)

gnu/gnutls

Red Hat/Red Hat AI Inference Server 3.2 1782951012

Red Hat/Red Hat AI Inference Server 3.2 1782951051

Red Hat/Red Hat AI Inference Server 3.2 1782951244

Red Hat/Red Hat Discovery 2 1782159791

Red Hat/Red Hat Discovery 2 1782166952

Red Hat/Red Hat Enterprise Linux 10

Red Hat/Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2

Red Hat/Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19

Red Hat/Red Hat Enterprise Linux 6

... and 34 more

Published Apr 30, 2026

Tracked Since Apr 30, 2026