PT-2026-43476 · Openstack · Openstack Swift

Alistair Coles · Published 2026-05-27 · Updated 2026-05-28 · CVE-2026-49017

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Name of the Vulnerable Software and Affected Versions OpenStack Swift versions 2.36.0 through 2.36.1 OpenStack Swift versions 2.37.0 through 2.37.1

Description The s3api middleware contains a flaw where the StreamingInput class enters an infinite loop when processing a truncated aws-chunked PUT request body. This occurs because the system repeatedly appends an empty buffer and re-reads the input, causing the proxy-server worker to become permanently unresponsive while consuming increasing amounts of CPU and memory. An authenticated attacker can exploit this to exhaust all proxy-server workers, leading to a denial of service.

Recommendations Update versions 2.36.0 through 2.36.1 to 2.36.2. Update versions 2.37.0 through 2.37.1 to 2.37.2.

Fix

DoS

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-49017

GHSA-G7JQ-J257-RWW2

Affected Products

Openstack Swift

References · 15

• https://cve.org/CVERecord?id=CVE-2026-49017 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-49017 · Vendor Advisory
• https://review.opendev.org/c/openstack/swift/+/987957 · Patch
• https://ubuntu.com/security/CVE-2026-49017 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-g7jq-j257-rww2 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-49017 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-49017 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-49017 · Vendor Advisory
• https://github.com/openstack/swift · Note
• https://t.me/CVEtracker/55052 · Telegram Post
• https://twitter.com/oss_security/status/2059929796033777789 · Twitter Post
• http://openwall.com/lists/oss-security/2026/06/02/6 · Note
• http://openwall.com/lists/oss-security/2026/05/27/9 · Note
• https://review.opendev.org/c/openstack/swift/+/988093 · Note
• https://bugs.launchpad.net/bugs/2152205 · Note