Netty: RedisArrayAggregator max-elements failure leaves retained partial aggregate state

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56818
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-07 18:17:19 UTC
Updated2026-08-08 04:17:47 UTC
DescriptionNetty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, the RedisArrayAggregator Redis codec clears retained partial aggregate state when the maxNestedArrayDepth limit is exceeded, but it does not clear the same state when the sibling maxElements limit is exceeded. A peer can start a valid RESP array, send a bulk string child, then send a nested array header longer than the configured maxElements. Netty throws a decoder exception in decodeRedisArrayHeader, but the existing partial aggregate remains retained in the handler. If the application leaves the channel alive after the exception, later messages are still consumed into the pre-error aggregate, allowing an unauthenticated peer to keep attacker-controlled aggregate state alive across a security-limit exception and pin retained pooled buffers. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS: 0.004650000 probability, percentile 0.379620000 (date 2026-08-10)

Problem Types: CWE-401 | CWE-703 | CWE-401 CWE-401: Missing Release of Memory after Effective Lifetime | CWE-703 CWE-703: Improper Check or Handling of Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Netty Netty affected < 4.1.136.Final Not specified
CNA Netty Netty affected >= 4.2.0-Final, < 4.2.16.Final Not specified

References

ReferenceSourceLinkTags
github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b [email protected] github.com
github.com/netty/netty/pull/17065 [email protected] github.com
github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 [email protected] github.com
github.com/netty/netty/security/advisories/GHSA-p9jm-q85p-7mcp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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