PT-2026-43476 · Openstack · Swift

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-49017

Mitre

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

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.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-49017

Affected Products

Swift

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-49017 · Security Note
• https://review.opendev.org/c/openstack/swift/+/987957 · Patch
• https://bugs.launchpad.net/bugs/2152205 · Note
• https://review.opendev.org/c/openstack/swift/+/988093 · Note