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TI-2026-32766 Aliases CVE-2026-44891GHSA-vhch-2wf3-m8rp

Netty: Denial of Service via Unbounded Headers in StompSubframeDecoder

Priority HIGH 72CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00728 54th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial netty (netty): 4.1.136.Final, 4.2.16.Finalio.netty:netty-codec-stomp (Maven): 4.2.16.Final, 4.1.136.FinalRed Hat: 2 advisoriesRed Hat: 2 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nettynettybefore 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final4.1.136.Final, 4.2.16.FinalPatch availableCNA
—io.netty:netty-codec-stomp (Maven)4.2.0.Alpha1 to before 4.2.16.Final4.2.16.FinalPatch availableGHSA-vhch-2wf3-m8rp
—io.netty:netty-codec-stomp (Maven)before 4.1.136.Final4.1.136.FinalPatch availableGHSA-vhch-2wf3-m8rp
  • netty Vendornetty Affected before 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final Fixed in 4.1.136.Final, 4.2.16.Final Patch available CNA
  • io.netty:netty-codec-stomp (Maven) Vendor— Affected 4.2.0.Alpha1 to before 4.2.16.Final Fixed in 4.2.16.Final Patch available GHSA-vhch-2wf3-m8rp
  • io.netty:netty-codec-stomp (Maven) Vendor— Affected before 4.1.136.Final Fixed in 4.1.136.Final Patch available GHSA-vhch-2wf3-m8rp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*before 4.1.136; 4.2.0 to before 4.2.16Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.136; 4.2.0 to before 4.2.16 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.1.136.Final, 4.2.16.Final
  • Fix · GHSA-vhch-2wf3-m8rp io.netty:netty-codec-stomp (Maven) Fixed in 4.2.16.Final Advisory →
  • Fix · GHSA-vhch-2wf3-m8rp io.netty:netty-codec-stomp (Maven) Fixed in 4.1.136.Final Advisory →

Red Hat 2 advisories

  • RHSA-2026:69296 Released 2026-09-21 · Red Hat rating Important
    Red Hat Data Grid 8.6.3 security update
    • Red Hat Data Grid 8.6.3
  • RHSA-2026:54622 Released 2026-08-13 · Red Hat rating Important
    Red Hat Build of Apache Camel 4.18.3 for Spring Boot release.
    • Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix yet: Fix deferred
Red Hat Single Sign-On 7AffectedNo fix yet: Fix deferred
Red Hat Data Grid 8.6.3Fixed RHSA-2026:69296
Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16Fixed RHSA-2026:54622
Not affected: 1 product
  • Red Hat JBoss Enterprise Application Platform Expansion Pack

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44891
  2. 2026-10-03 Alias added: GHSA-vhch-2wf3-m8rp

References

Exploit 1

Patch 4

Other 3

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2026-30861 Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization CVSS 3.1CRITICAL 9.8
  • TI-2026-30864 Netty: HttpClientCodec response desynchronization CVSS 3.1CRITICAL 9.1
  • TI-2026-30859 Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) CVSS 3.1CRITICAL 9.1
  • TI-2026-40973 Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks CVSS 3.1CRITICAL 9.1
  • TI-2026-40972 Uncontrolled resource consumption in netty CVSS 3.1HIGH 7.5
See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences