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CVE-2026-56818— Netty: RedisArrayAggregator max-elements failure leaves retained partial aggregate state

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProductVersion RangeStatus
nettynetty< 4.1.136.Finalaffected
>= 4.2.0-Final, < 4.2.16.Finalaffected
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I. Basic Information for CVE-2026-56818

Vulnerability Information
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Vulnerability Title
Netty: RedisArrayAggregator max-elements failure leaves retained partial aggregate state
Source: CVE Program / CVE List V5
Vulnerability Description
Netty 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
nettynetty < 4.1.136.Final -

II. Public POCs for CVE-2026-56818

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III. Intelligence Information for CVE-2026-56818

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Patches & Fixes for CVE-2026-56818 (1)

Vendor Advisories for CVE-2026-56818 (1)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-401

V. Comments for CVE-2026-56818

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