Skip to content
Fencer Vulns
high 7.5

CVE-2026-59902 json

Netty: Memory Exhaustion in SctpMessageCompletionHandler

published 2026-08-17 2 mo ago modified 2026-09-23 46 d ago also GHSA-2qj4-mmr9-4v2f , EUVD-2026-60314

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedBytes, allowing unauthenticated peers to exhaust memory with large SCTP fragments. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Patch / fix

  • maven io.netty:netty-transport-sctp 4.1.137.Final, 4.2.17.Final
  • netty netty 4.1.137, 4.2.17
  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.84-150200.3.51.1
  • netty SLE Module for Package Hub 15 SP7 4.1.138-150200.4.56.1

suse advisories SUSE-SU-2026:4391-1

  • netty openSUSE Tumbleweed 4.1.138-1.1

opensuse advisories openSUSE-SU-2026:11882-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-59902 updated cvss 7.5

io.netty/netty-transport-sctp: Netty: Denial of Service via SCTP memory exhaustion

  • Red Hat Enterprise Linux AI (RHEL AI) 3 bazel6 6.5.0-2.el9ai
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Application Platform 7 jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, netty-transport-sctp 4.1.77.Final-redhat-00001, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 Red Hat Single Sign-On 7 netty-transport-sctp 4.1.77.Final-redhat-00001
    affected: workaround, no fix planned “Will not fix”
  • Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:71675
  • Red Hat Fuse 7 netty-transport-sctp 4.1.77.Final-redhat-00001
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-transport-sctp
>=4.2.0.Final, <4.2.17.Final
<4.1.137.Final
4.2.17.Final
4.1.137.Final

Affected products

  • netty netty

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.