High 7.5Published Jun 12, 2026

CVE-2026-44893Netty: HAProxy SSL TLV parsing leaks retained slice on invalid TLV length

Updated under an hour ago (Oct 27, 2026, 2:23 AM ET)

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It affects netty and 21 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-703, CWE-805
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

netty netty netty:netty (from the name)	from 4.2.0.Final, < 4.2.15.Final; before 4.1.135.Final	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-13 not affected	CISA ADP
Red Hat Red Hat AMQ Broker 7.14.1 redhat:amq_broker	from codec-haproxy not affected	CISA ADP
Red Hat Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1 redhat:apache_camel_quarkus	from codec-haproxy not affected	CISA ADP
Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 redhat:apache_camel_spring_boot	from codec-haproxy not affected	CISA ADP
Red Hat Red Hat build of Quarkus 3.27.4.SP1 redhat:quarkus	from codec-haproxy not affected	CISA ADP
Red Hat Red Hat Data Grid 8.6.2 redhat:jboss_data_grid	from codec-haproxy not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els	from 0:2.16.0-22.redhat_00057.1.el7eap not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 redhat:jboss_enterprise_application_platform_xp	from codec-haproxy not affected	CISA ADP
Red Hat Streams for Apache Kafka 2.9.4 redhat:amq_streams	from codec-haproxy not affected	CISA ADP
1–10 of 23

References

References

https://github.com/netty/netty/security/advisories/GHSA-cc37-9q2j-3hfv	x-refsource-confirm, vendor-advisory
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final	x-refsource-misc, release-notes
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final	x-refsource-misc, release-notes
https://access.redhat.com/errata/RHSA-2026:26017
https://access.redhat.com/errata/RHSA-2026:26018
https://access.redhat.com/errata/RHSA-2026:26586
https://access.redhat.com/errata/RHSA-2026:34608
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/errata/RHSA-2026:37390
https://access.redhat.com/errata/RHSA-2026:41951
1–10 of 21

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.