CVE-2026-121727

NameCVE-2026-121727
DescriptionKore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes than declared. Attackers can send oversized first segments over many concurrent POST, PUT or DELETE connections, wrapping content_length to grow buffers unbounded and exhaust worker memory.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1153257

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
kore (PTS)bookworm4.1.0-6vulnerable
forky, sid4.2.3-2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
koresource(unstable)(unfixed)1153257

Notes

[trixie] - kore <no-dsa> (Minor issue)
https://github.com/jorisvink/kore/commit/1ff3c0f6f7973dc7fc8bf38369790ef2d8079b3b

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