DescriptionPuma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1060345

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
puma (PTS)buster3.12.0-2+deb10u2vulnerable
buster (security)3.12.0-2+deb10u3vulnerable
bullseye (security)4.3.8-1+deb11u2vulnerable
sid, trixie6.4.2-4fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - puma <no-dsa> (Minor issue)
[bullseye] - puma <no-dsa> (Minor issue)
[buster] - puma <no-dsa> (Minor issue) (v5.6.8)

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