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CVE-2026-59902

Netty: Memory Exhaustion in SctpMessageCompletionHandler

HIGH
7.5
CVSS Score
Published: August 17, 2026 at 05:48 PM UTC
Updated: September 23, 2026 at 03:48 PM UTC
1 product affected across 1 vendorNetty

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Netty· Nettymaven
95%
v < 4.1.137v < 4.1.137.Finalv < 4.2.17.Final4.2.0 ≤ v < 4.2.17
Affected range stops below 4.1.137, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.137.Final, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.17.Final, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/netty/netty/security/advisories/GHSA-2qj4-mmr9-4v2f
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/netty/netty/pull/17213
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/netty/netty/pull/17217
x_refsource_MISCPatch
Source: cverecord
https://github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/netty/netty/releases/tag/netty-4.1.137.Final
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/netty/netty/releases/tag/netty-4.2.17.Final

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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