CVEvulnerability
CVE-2026-49017
7.1 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-27
- Last modified
- 2026-09-24
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 7.1 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-835
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.
Affected configurations
• openstack swift (>= 2.35.1 < 2.35.3)
• openstack swift (>= 2.36.0 < 2.36.2)
• openstack swift (>= 2.37.0 < 2.37.2)
Related
Weakness · CWE (1)
- CWE-835 Loop with Unreachable Exit Condition weakness
References
- https://bugs.launchpad.net/bugs/2152205 Issue Tracking, Vendor Advisory
- https://review.opendev.org/c/openstack/swift/+/987957 Issue Tracking, Patch
- https://review.opendev.org/c/openstack/swift/+/988093 Issue Tracking, Patch
- http://www.openwall.com/lists/oss-security/2026/05/27/9 Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/06/02/6 Mailing List, Patch, Third Party Advisory