CVE-2026-44891

HIGH 7.5

Netty: Denial of Service via Unbounded Headers in StompSubframeDecoder

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.stomp.StompSubframeDecoder fails to limit the total number of headers or their cumulative size per frame, and the maxLineLength parameter only restricts individual header lines. An attacker can send a large number of short headers that are accumulated in memory inside DefaultStompHeadersSubframe until the JVM throws an OutOfMemoryError, causing denial of service for servers exposing a STOMP endpoint based on StompSubframeDecoder. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

CWE	CWE-400 CWE-770
Vendor	netty
Product	netty
Published	Jul 17, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

netty / netty

< 4.1.136.Final >= 4.2.0.Final, < 4.2.16.Final

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/netty/netty/security/advisories/GHSA-vhch-2wf3-m8rp github.com: https://github.com/netty/netty/pull/17063 github.com: https://github.com/netty/netty/pull/17065 github.com: https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b github.com: https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 github.com: https://github.com/netty/netty/releases/tag/netty-4.1.136.Final github.com: https://github.com/netty/netty/releases/tag/netty-4.2.16.Final