CVE-2026-59899High· 7.5▾ TwilightA flaw was found in the Netty netty-codec-http component. A remote attacker can send HTTP requests containing highly compressed data. The HTTP decoder in netty-codec-http fails to properly limit the decompression of this content, causing t…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 31.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
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Last analysed / modified upstream
A flaw was found in the Netty netty-codec-http component. A remote attacker can send HTTP requests containing highly compressed data. The HTTP decoder in netty-codec-http fails to properly limit the decompression of this content, causing the system to consume excessive memory. This can lead to memory exhaustion and a denial of service (DoS), making the service unavailable to legitimate users.
io.netty/netty-codec-http: Netty: Memory exhaustion in netty-codec-http (decompression bomb) — rated Important by Red Hat. Released 2026-07-09, updated 2026-10-20.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:70230 Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:70228 Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:68333
Workarounds / mitigations:
Affected packages:
io.netty:netty-codec-http >= 4.2.0.Final, <= 4.2.15.Finalio.netty:netty-codec-http < 4.1.136.FinalPatched in:
io.netty:netty-codec-http 4.2.16.Finalio.netty:netty-codec-http 4.1.136.FinalField changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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