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Fencer Intel
high 7.5

CVE-2026-59902 json

Netty: Memory Exhaustion in SctpMessageCompletionHandler

published 2mo ago modified last mo. also EUVD-2026-60314 , GHSA-2qj4-mmr9-4v2f

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
  • io.netty netty-transport-sctp 4.1.137.Final, 4.2.17.Final
  • netty netty 4.1.137.Final, 4.2.17.Final
  • 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

Is CVE-2026-59902 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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
2mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-11).

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.