CVE-2026-49017
HIGH EPSS 23.9%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 4.0
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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 Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
23.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-835
References 5
- openwall.com http://www.openwall.com/lists/oss-security/2026/05/27/9
- openwall.com http://www.openwall.com/lists/oss-security/2026/06/02/6
- bugs.launchpad.net https://bugs.launchpad.net/bugs/2152205
- review.opendev.org https://review.opendev.org/c/openstack/swift/+/987957
- review.opendev.org https://review.opendev.org/c/openstack/swift/+/988093
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.