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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://bugs.launchpad.net/bugs/2152205 issue-trackingIssue TrackingVendor Advisory
• https://review.opendev.org/c/openstack/swift/+/987957 patchIssue TrackingPatch
• https://review.opendev.org/c/openstack/swift/+/988093 technical-descriptionIssue TrackingPatch
• http://www.openwall.com/lists/oss-security/2026/05/27/9 Mailing ListPatchThird Party Advisory
• http://www.openwall.com/lists/oss-security/2026/06/02/6 Mailing ListPatchThird Party Advisory