CVE-2026-1760

Name	CVE-2026-1760
Description	A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.
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	1126876

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libsoup2.4 (PTS)	bullseye	2.72.0-2	vulnerable
	bullseye (security)	2.72.0-2+deb11u3	vulnerable
	bookworm	2.74.3-1+deb12u1	vulnerable
	trixie	2.74.3-10.1	vulnerable
libsoup3 (PTS)	bookworm	3.2.3-0+deb12u2	vulnerable
	trixie	3.6.5-3	vulnerable
	forky	3.6.5-7	vulnerable
	sid	3.6.5-9	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libsoup2.4	source	(unstable)	(unfixed)
libsoup3	source	(unstable)	3.6.5-8			1126876

Notes

[trixie] - libsoup3 <no-dsa> (Minor issue)
[bookworm] - libsoup3 <no-dsa> (Minor issue)
[trixie] - libsoup2.4 <no-dsa> (Minor issue)
[bookworm] - libsoup2.4 <no-dsa> (Minor issue)
https://gitlab.gnome.org/GNOME/libsoup/-/issues/475
Fixed by: https://gitlab.gnome.org/GNOME/libsoup/-/commit/6224df5a471e9040a99dd3dc2e91817a701b1bf6