CVE-2026-33846: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-qcj7-gqxf-2cqq
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CVSS 7.5
CWE-130
Published
Advisory Summary

CVE-2026-33846 is a HIGH (CVSS 7.5) security vulnerability vulnerability (CWE-130: Improper Handling of Length Parameter Inconsistency) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-33846 at a Glance

CVE Identifier CVE-2026-33846
GHSA Identifier GHSA-qcj7-gqxf-2cqq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-130: Improper Handling of Length Parameter Inconsistency
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-33846

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-33846, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-130: Improper Handling of Length Parameter Inconsistency, where the product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.

References

NVD — CVE-2026-33846 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33846
access.redhat.com/errata/rhsa-2026:13... WEB
https://access.redhat.com/errata/RHSA-2026:13274
access.redhat.com/errata/rhsa-2026:57... WEB
https://access.redhat.com/errata/RHSA-2026:57402
access.redhat.com/errata/rhsa-2026:57... WEB
https://access.redhat.com/errata/RHSA-2026:57483
access.redhat.com/errata/rhsa-2026:58... WEB
https://access.redhat.com/errata/RHSA-2026:58981
access.redhat.com/errata/rhsa-2026:59... WEB
https://access.redhat.com/errata/RHSA-2026:59831
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60019
access.redhat.com/errata/rhsa-2026:65... WEB
https://access.redhat.com/errata/RHSA-2026:65839
access.redhat.com/errata/rhsa-2026:72... WEB
https://access.redhat.com/errata/RHSA-2026:72502
access.redhat.com/errata/rhsa-2026:74... WEB
https://access.redhat.com/errata/RHSA-2026:74674
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82304
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82322
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82347
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82354
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82372
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82857
access.redhat.com/errata/rhsa-2026:82... WEB
https://access.redhat.com/errata/RHSA-2026:82888
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-33846
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2450625
Software Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33846.json
access.redhat.com/errata/rhsa-2026:20... WEB
https://access.redhat.com/errata/RHSA-2026:20611
access.redhat.com/errata/rhsa-2026:20... WEB
https://access.redhat.com/errata/RHSA-2026:20612
access.redhat.com/errata/rhsa-2026:20... WEB
https://access.redhat.com/errata/RHSA-2026:20613
access.redhat.com/errata/rhsa-2026:26... WEB
https://access.redhat.com/errata/RHSA-2026:26319
access.redhat.com/errata/rhsa-2026:26... WEB
https://access.redhat.com/errata/RHSA-2026:26409
access.redhat.com/errata/rhsa-2026:29... WEB
https://access.redhat.com/errata/RHSA-2026:29197
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30004
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30849
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30850
access.redhat.com/errata/rhsa-2026:32... WEB
https://access.redhat.com/errata/RHSA-2026:32962
access.redhat.com/errata/rhsa-2026:33... WEB
https://access.redhat.com/errata/RHSA-2026:33125
access.redhat.com/errata/rhsa-2026:34... WEB
https://access.redhat.com/errata/RHSA-2026:34372
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36004
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36005
access.redhat.com/errata/rhsa-2026:36... WEB
https://access.redhat.com/errata/RHSA-2026:36006
access.redhat.com/errata/rhsa-2026:41... WEB
https://access.redhat.com/errata/RHSA-2026:41921
access.redhat.com/errata/rhsa-2026:56... WEB
https://access.redhat.com/errata/RHSA-2026:56786
access.redhat.com/errata/rhsa-2026:56... WEB
https://access.redhat.com/errata/RHSA-2026:56853
access.redhat.com/errata/rhsa-2026:56... WEB
https://access.redhat.com/errata/RHSA-2026:56911

Frequently Asked Questions

What is CVE-2026-33846?
CVE-2026-33846 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-130: Improper Handling of Length Parameter Inconsistency.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-33846?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-33846?
CVE-2026-33846 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-33846?
CVE-2026-33846 is classified under CWE-130: Improper Handling of Length Parameter Inconsistency (The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.).
How can I check Maven dependencies for CVE-2026-33846?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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