Vulnerability · Published Aug 5, 2026 · Assigned by mitre
CVE-2026-71190
High 8.7
In plain English
A high-severity regular-expression denial of service in Swift from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | swift | 2.30.1-0+deb12u2 | DEBIAN-CVE-2026-71190 |
| Debian:13 | swift | no fix listed | DEBIAN-CVE-2026-71190 |
| Debian:14 | swift | 2.37.1-6 | DEBIAN-CVE-2026-71190 |
| Ubuntu:22.04:LTS | swift | no fix listed | UBUNTU-CVE-2026-71190 |
| Ubuntu:24.04:LTS | swift | no fix listed | UBUNTU-CVE-2026-71190 |
| Ubuntu:26.04:LTS | swift | no fix listed | UBUNTU-CVE-2026-71190 |
| Ubuntu:26.10 | swift | no fix listed | UBUNTU-CVE-2026-71190 |
Affected products (as reported)
Weakness: CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://launchpad.net/bugs/2158771 issue-tracking
- https://openwall.com/lists/oss-security/2026/07/28/27 vendor-advisory, mailing-list
- https://security.openstack.org/ossa/OSSA-2026-031.html vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/08/05/19