High severity · published Aug 17, 2026
CVE-2026-59902
Netty: Memory Exhaustion in SctpMessageCompletionHandler
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
netty · netty
< 4.1.137.Final; >= 4.2.0.Final, < 4.2.17.Final · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59902
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59902
Patch
https://github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7
Issue Tracking
https://github.com/netty/netty/pull/17213
Issue Tracking
https://github.com/netty/netty/pull/17217
Release Notes
https://github.com/netty/netty/releases/tag/netty-4.1.137.Final
Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.17.Final
Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-2qj4-mmr9-4v2f
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