CVE-2026-42587

EUVD-2026-30130

13.05.2026, 19:17

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 59.31%

Affected Products (NVD)

Vendor	Product	Version
netty	netty	𝑥 < 4.1.133
netty	netty	4.2.0 ≤ 𝑥 < 4.2.13

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
Red Hat	Cryostat 4 on RHEL 9	4.2.0-10 ≤ 𝑥 < *	ADP
Red Hat	Cryostat 4 on RHEL 9	4.2.0-10 ≤ 𝑥 < *	ADP
Red Hat	Cryostat 4 on RHEL 9	4.2.0-10 ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Quarkus 3.27.4	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat build of Quarkus 3.27.4	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat Data Grid 8.6.2	codec-http ≤ 𝑥 < *	ADP
Red Hat	Red Hat Data Grid 8.6.2	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Streams for Apache Kafka 2.9.4	codec-http2 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift AI 2.25	1783443816 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.28	1780948325 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.28	1780696380 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.28	1780694994 ≤ 𝑥 < *	ADP
Red Hat	Red Hat OpenShift Dev Spaces 3.29	1782989027 ≤ 𝑥 < *	ADP

Debian Releases

Debian Product

Codename

netty

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	vulnerable
sid	vulnerable
trixie	vulnerable
trixie (security)	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

netty

bionic	not-affected
focal	not-affected
jammy	not-affected
noble	not-affected
questing	not-affected
resolute	not-affected
trusty	not-affected

openSUSE / SLES Releases

openSUSE Product

Release

netty-tcnative

suse enterprise desktop 15 SP7	2.0.77-150200.3.39.1 fixed
suse enterprise sap 15 SP4	2.0.77-150200.3.39.1 fixed
suse enterprise sap 15 SP5	2.0.77-150200.3.39.1 fixed
suse enterprise sap 15 SP6	2.0.77-150200.3.39.1 fixed
suse enterprise sap 15 SP7	2.0.77-150200.3.39.1 fixed
suse enterprise server 15 SP4	2.0.77-150200.3.39.1 fixed
suse enterprise server 15 SP5	2.0.77-150200.3.39.1 fixed
suse enterprise server 15 SP6	2.0.77-150200.3.39.1 fixed
suse enterprise server 15 SP7	2.0.77-150200.3.39.1 fixed