What’s Vulnerable › Vulnerabilities

CVE-2026-71190

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-24
• Weakness: CWE-1333

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 products

• OpenStack Swift: from 1.9.1 before 2.35.4; from 2.36.0 before 2.36.3; from 2.37.0 before 2.37.3; 2.38.0 — fixed in 2.35.4, 2.36.3, 2.37.3

How to fix

Upgrade to a fixed version: OpenStack Swift 2.35.4, 2.36.3, 2.37.3. Check the vendor advisory for mitigations.

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

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