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Netty CVE-2026-44250

HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-06-08 https://github.com/netty/netty GHSA-3244-j874-rhc2
Denial Of Service Redis
7.5
CVSS 3.1 · Vendor: https://github.com/netty/netty
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Severity by source

Vendor (https://github.com/netty/netty) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (https://github.com/netty/netty).

CVSS VectorVendor: https://github.com/netty/netty

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Source Code Evidence Fetched
Jun 08, 2026 - 19:50 vuln.today
Analysis Generated
Jun 08, 2026 - 19:50 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 76 maven packages depend on io.netty:netty-codec-redis (4 direct, 72 indirect)

Ecosystem-wide dependent count for version 4.2.0.Final.

DescriptionCVE.org

Summary

An attacker can cause DoS by sending a crafted Redis payload with deeply nested arrays. This forces the server to allocate a massive number of state objects and collections, leading to memory exhaustion and an OutOfMemoryError.

Details

io.netty.handler.codec.redis.RedisArrayAggregator aggregates RedisMessage parts into ArrayRedisMessage. It uses a Deque<AggregateState> to keep track of nested arrays. However, it does not limit the maximum depth of nested arrays. When an attacker sends a continuous stream of nested array headers (e.g., *1\r\n*1\r\n*1\r\n...), RedisArrayAggregator pushes a new AggregateState onto the stack and allocates a new ArrayList for each header. Because there is no depth limit, an attacker can send millions of such headers. This consumes a massive amount of heap memory for the AggregateState instances and their backing ArrayLists, eventually resulting in an OutOfMemoryError.

Impact

Denial of Service due to memory exhaustion. Any application using Netty's RedisArrayAggregator to handle untrusted Redis traffic is vulnerable.

AnalysisAI

Denial of service in Netty's netty-codec-redis module (versions <= 4.1.134.Final and 4.2.0.Final through 4.2.14.Final) allows remote unauthenticated attackers to exhaust JVM heap memory by sending Redis payloads with unbounded nested array headers. The RedisArrayAggregator allocates a new AggregateState and ArrayList for every nested array header without enforcing a depth limit, so a continuous stream of *1\r\n headers triggers an OutOfMemoryError. No public exploit identified at time of analysis, and the issue is not listed in CISA KEV.

Technical ContextAI

Netty is a widely embedded asynchronous network application framework for the JVM, and netty-codec-redis implements the RESP (REdis Serialization Protocol) used to talk to Redis servers. The vulnerable class io.netty.handler.codec.redis.RedisArrayAggregator reassembles streamed RedisMessage parts into ArrayRedisMessage objects, using a Deque<AggregateState> to track each level of nesting. The root cause is CWE-400 (Uncontrolled Resource Consumption): the aggregator pushes a fresh AggregateState plus a backing ArrayList for every array header it sees, but never caps the maximum nesting depth, so the attacker controls how many state objects get allocated on the heap. Affected packages per CPE are pkg:maven/io.netty:netty-codec-redis on both the 4.1.x and 4.2.x release lines.

RemediationAI

Vendor-released patch: upgrade to io.netty:netty-codec-redis 4.1.135.Final (4.1.x line) or 4.2.15.Final (4.2.x line) as documented at https://github.com/netty/netty/releases/tag/netty-4.1.135.Final and https://github.com/netty/netty/releases/tag/netty-4.2.15.Final and tracked in advisory https://github.com/netty/netty/security/advisories/GHSA-3244-j874-rhc2. If upgrading the Netty dependency cannot be done immediately, restrict the RESP-accepting endpoint to trusted peers via network ACLs or mTLS so only authenticated Redis clients can reach the decoder, or front the service with a Redis-aware proxy that rejects pathologically nested arrays - note that ACL-based mitigations only help where the deployment can practically enumerate trusted callers, and a proxy adds latency and a new failure point. Lowering the JVM heap or enabling -XX:+ExitOnOutOfMemoryError will not prevent the DoS but can shorten time-to-restart and contain blast radius until the patched version is rolled out.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-44250 vulnerability details – vuln.today
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