Vulnerability details
CVE-2026-71190
OpenStack Swift
CVSS 4.0
8.7High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (mitre) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| OpenStack | Swift | 2.38.0 | CVEProject cvelistV5 (CNA) |
| OpenStack | Swift | 1.9.1 ≤ v < 2.35.4 | CVEProject cvelistV5 (CNA) |
| OpenStack | Swift | 2.36.0 ≤ v < 2.36.3 | CVEProject cvelistV5 (CNA) |
| OpenStack | Swift | 2.37.0 ≤ v < 2.37.3 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://launchpad.net/bugs/2158771 issue-tracking
- https://openwall.com/lists/oss-security/2026/07/28/27 vendor-advisorymailing-list
- https://security.openstack.org/ossa/OSSA-2026-031.html vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/08/05/19
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Details
- Published
- 2026-08-05
- Last updated
- 2026-08-06
- State
- Published
- Assigner (CNA)
- mitre
Exploit prediction (EPSS)
0.83%
Probability of exploitation in 30 days
57.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-1333Inefficient Regular Expression Complexity