CVE-2026-33845

9.1

CRITICAL CVSS 3.1

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

Overview

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.

Details

INFO

Published Date :

April 30, 2026, 6:16 p.m.

Last Modified :

May 5, 2026, 3:03 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-33845 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Redhat	enterprise_linux
2	Redhat	openshift_container_platform
3	Redhat	hardened_images
1	Gnu	gnutls

: Total Affected Vendor : 2 | Products : 4

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS 3.1	HIGH	53f830b8-0a3f-465b-8143-3b8a9948e749
CVSS 3.1	HIGH	[email protected]
CVSS 3.1	HIGH	MITRE-CVE
CVSS 3.1	CRITICAL	[email protected]

Solution

Update GnuTLS to fix an integer underflow and out-of-bounds read vulnerability.

Update GnuTLS to the latest version.
Apply vendor patches for GnuTLS.
Review GnuTLS configurations for security.
Monitor for unexpected application behavior.

Public PoC/Exploit Available at Github

CVE-2026-33845 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-33845.

URL	Resource
https://access.redhat.com/errata/RHSA-2026:13274	Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-33845	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2450624	Issue Tracking Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-33845 is associated with the following CWEs:

CWE-191: Integer Underflow (Wrap or Wraparound)

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-33845 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

jbanday808/aws-zero-trust-architecture

Enterprise AWS Zero Trust Architecture with ECS Fargate, WAF, KMS, GuardDuty, Security Hub, and CloudTrail.

Dockerfile HTML Shell

Updated: 3 days, 14 hours ago

0 stars 0 fork 0 watcher

Born at : May 17, 2026, 10:23 p.m. This repo has been linked 2 different CVEs too.

BarAppTeam/nginx-cve-fix

None

Dockerfile Makefile Shell Python

Updated: 3 days, 2 hours ago

0 stars 0 fork 0 watcher

Born at : May 16, 2026, 7:57 p.m. This repo has been linked 24 different CVEs too.

guhigawa/Projeto-final-DevOps

None

Dockerfile Python Shell Makefile

Updated: 1 week, 3 days ago

1 stars 0 fork 0 watcher

Born at : Oct. 20, 2025, 4:41 p.m. This repo has been linked 4 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-33845 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-33845 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

May. 05, 2026

Action	Type	New Value
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Added	CPE Configuration	OR cpe:2.3:o:redhat:enterprise_linux:7.0::::::: cpe:2.3:o:redhat:enterprise_linux:6.0::::::: cpe:2.3:a:gnu:gnutls:-::::::: cpe:2.3:o:redhat:enterprise_linux:8.0::::::: cpe:2.3:a:redhat:openshift_container_platform:4.0::::::: cpe:2.3:o:redhat:enterprise_linux:9.0::::::: cpe:2.3:o:redhat:enterprise_linux:10.0:::::::
Added	Reference Type	Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:13274 Types: Vendor Advisory
Added	Reference Type	Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-33845 Types: Vendor Advisory
Added	Reference Type	Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2450624 Types: Issue Tracking, Vendor Advisory

CVE Modified by [email protected]

May. 03, 2026

Action	Type	Old Value	New Value
Added	Reference		https://access.redhat.com/errata/RHSA-2026:13274

New CVE Received by [email protected]

Apr. 30, 2026

Action	Type	New Value
Added	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.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-191
Added	Reference	https://access.redhat.com/security/cve/CVE-2026-33845
Added	Reference	https://bugzilla.redhat.com/show_bug.cgi?id=2450624

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.