Description (CNA)
In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The "qdtext" pattern (?:[^"]|\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| OpenStack / Swift | affected 1.9.1 before 2.35.4; affected 2.36.0 before 2.36.3; affected 2.37.0 before 2.37.3; affected 2.38.0 |
CWE
CWE-1333
References
- https://launchpad.net/bugs/2158771
- https://openwall.com/lists/oss-security/2026/07/28/27
- https://security.openstack.org/ossa/OSSA-2026-031.html
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.