CVE-2026-31842

Name	CVE-2026-31842
Description	Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The is_chunked_transfer function uses strcmp to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive.
Source	CVE (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 Bugs	1133355

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tinyproxy (PTS)	bookworm, bookworm (security)	1.11.1-2.1+deb12u1	vulnerable
	trixie	1.11.2-1	vulnerable
	forky, sid	1.11.3-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
tinyproxy	source	(unstable)	(unfixed)			1133355

Notes

[trixie] - tinyproxy <no-dsa> (Minor issue)
[bookworm] - tinyproxy <no-dsa> (Minor issue)
[bullseye] - tinyproxy <postponed> (Minor issue)
https://github.com/tinyproxy/tinyproxy/issues/604
https://github.com/tinyproxy/tinyproxy/commit/879bf844abffa0bf5fae6aff0c73179024dd9f98