CVE-2026-71190

Name	CVE-2026-71190
Description	In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The "qdtext" pattern (?:[^"]\|\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service.
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)
References	DLA-4746-1
Debian Bugs	1142973

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
swift (PTS)	bullseye	2.26.0-10+deb11u1	vulnerable
	bullseye (security)	2.26.0-10+deb11u2	vulnerable
	bookworm	2.30.1-0+deb12u1	vulnerable
	bookworm (security)	2.30.1-0+deb12u2	fixed
	trixie	2.35.1-0+deb13u2	vulnerable
	trixie (security)	2.35.1-0+deb13u3	vulnerable
	forky, sid	2.37.1-6	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
swift	source	bookworm	2.30.1-0+deb12u2		DLA-4746-1
swift	source	(unstable)	2.37.1-6			1142973

[trixie] - swift <no-dsa> (Minor issue)
https://security.openstack.org/ossa/OSSA-2026-031.html
https://bugs.launchpad.net/swift/+bug/2158771