DescriptionThe ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2364-1, DSA-4885-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
netty (PTS)stretch1:4.1.7-2+deb9u1vulnerable
stretch (security)1:4.1.7-2+deb9u3fixed
buster, buster (security)1:4.1.33-1+deb10u2fixed
bookworm, bullseye, sid1:4.1.48-4fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[jessie] - netty <ignored> (OOM DoS with fix/mitigation involving new API; too intrusive to backport due to more limited 3.x buffer API)

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