CVE-2026-44891 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44891HIGH

Netty: Denial of Service via Unbounded Headers in StompSubframeDecoder

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0042   35.5     —

AFFECTED
  Product  Versions           Fixed
  netty    < 4.1.136.Final –  —

TIMELINE
  May 7   Reserved by GitHub_M
  Jul 17  EXPLOIT PUBLISHED — CVE-2026-44891 (netty). Public exploit reference added.
  Jul 17  Published (CNA: GitHub_M)
  Jul 23  EXPLOIT PUBLISHED — CVE-2026-44891 (netty). Public exploit reference added.

CWE-400, CWE-770 · CNA: GitHub_M · CVSS v3.1 · 7 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 7, 2026	Reserved	Reserved by GitHub_M
July 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44891 (netty). Public exploit reference added.
July 17, 2026	Published	Published (CNA: GitHub_M)
July 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44891 (netty). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
netty	netty	—	< 4.1.136.Final	—

Weaknesses

CWE-400 · CWE-770

References (7)

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b [Patch]
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 [Patch]
https://github.com/netty/netty/pull/17063 [Issue Tracking, Patch]
https://github.com/netty/netty/pull/17065 [Issue Tracking, Patch]
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final [Release Notes]
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final [Release Notes]
https://github.com/netty/netty/security/advisories/GHSA-vhch-2wf3-m8rp [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-44891 at cve.org

Vendors: netty

Weaknesses: CWE-400 · CWE-770

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44891 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.