CVE-2026-49017

Name	CVE-2026-49017
Description	In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.
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	DSA-6314-1
Debian Bugs	1138170

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	fixed
	bullseye (security)	2.26.0-10+deb11u2	fixed
	bookworm, bookworm (security)	2.30.1-0+deb12u1	fixed
	trixie	2.35.1-0+deb13u1	vulnerable
	trixie (security)	2.35.1-0+deb13u2	fixed
	forky, sid	2.37.1-4	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
swift	source	bullseye	(not affected)
swift	source	bookworm	(not affected)
swift	source	trixie	2.35.1-0+deb13u2	DSA-6314-1
swift	source	(unstable)	2.37.1-4		1138170

Notes

[bookworm] - swift <not-affected> (Support for aws-chunked introduced in 2.35.1)
[bullseye] - swift <not-affected> (Support for aws-chunked introduced in 2.35.1)
https://www.openwall.com/lists/oss-security/2026/05/27/9
https://bugs.launchpad.net/swift/+bug/2152205