Vulnerability Description
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.
Related Weaknesses (CWE)
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
- http://www.openwall.com/lists/oss-security/2026/08/05/19
FAQ
What is CVE-2026-71190?
CVE-2026-71190 is a documented vulnerability. 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 una...
How severe is CVE-2026-71190?
CVSS scoring is not yet available for CVE-2026-71190. Check NVD for updates.
Is there a patch for CVE-2026-71190?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.