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CVE-2026-44893

7.5 · HIGH

Netty is a network application framework for development of protocol servers and clients.

Published Jun 12, 2026CWE-703EPSS 0.88%

Overview

CVE-2026-44893 is a high-severity vulnerability. It was published on June 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Netty is a network application framework for development of protocol servers and clients. In netty-codec-haproxy prior to versions 4.1.135.Final and 4.2.15.Final, when decoding a PP2_TYPE_SSL TLV, HAProxyMessage.readNextTLV() first calls `header.retainedSlice(header.readerIndex(), length)` and only then reads the 1-byte client field and 4-byte verify field. If the attacker sets the TLV length below 5, the subsequent readByte/readInt throws IndexOutOfBoundsException. HAProxyMessageDecoder only catches HAProxyProtocolException around this call, so the IOOBE propagates and the retained slice on the pooled cumulation buffer is never released. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/netty/netty/releases/tag/netty-4.1.135.FinalGitHubgithub.com/netty/netty/releases/tag/netty-4.2.15.FinalGitHubgithub.com/netty/netty/security/advisories/GHSA-cc37-9q2j-3hfvRefaccess.redhat.com/errata/RHSA-2026:26017Refaccess.redhat.com/errata/RHSA-2026:26018Refaccess.redhat.com/errata/RHSA-2026:26586Refaccess.redhat.com/errata/RHSA-2026:34608Refaccess.redhat.com/errata/RHSA-2026:36820Refaccess.redhat.com/errata/RHSA-2026:37390Refaccess.redhat.com/errata/RHSA-2026:41951

How CyberStrike helps

Frequently asked questions

What is CVE-2026-44893?

CVE-2026-44893 is a high-severity vulnerability. It was published on June 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-44893?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-44893?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-44893?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-44893 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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