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Netty CVE-2026-56745

| EUVDEUVD-2026-46452 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-07-21 GitHub_M GHSA-jppx-w49h-x2qq
Denial Of Service Red Hat Netty
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Jul 21, 2026 - 23:36 EUVD
Source Code Evidence Fetched
Jul 21, 2026 - 22:08 vuln.today
Analysis Generated
Jul 21, 2026 - 22:08 vuln.today
CVE Published
Jul 21, 2026 - 21:31 cve.org
HIGH 8.7

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 344 maven packages depend on io.netty:netty-codec-http (32 direct, 312 indirect)

Ecosystem-wide dependent count for version 4.2.0.Final.

DescriptionCVE.org

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec allocates a pooled ByteBuf when processing a client-initiated SYN_STREAM frame with FLAG_FIN=0 and stores the partially constructed FullHttpRequest in messageMap; when the remote peer sends RST_STREAM for that stream or the accumulated content exceeds maxContentLength, the decoder removes the entry but does not release the pooled ByteBuf, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

AnalysisAI

Uncontrolled native-memory consumption in Netty's SPDY-to-HTTP codec (SpdyHttpDecoder) lets a remote unauthenticated peer exhaust off-heap memory and crash the server. Affected versions are 4.2.0.Final–4.2.15.Final and 4.1.0.Final–4.1.135.Final; the decoder allocates a pooled ByteBuf for an in-flight SYN_STREAM request but fails to release it when the stream is aborted via RST_STREAM or when content exceeds maxContentLength. There is no public exploit identified at time of analysis, and this CVE is not listed in CISA KEV; impact is denial of service only (VC:N/VI:N/VA:H).

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Not-Affected

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CVE-2026-56745 vulnerability details – vuln.today
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