CVE-2026-71190

HighCVSS 8.7/10Last modified Oct 24, 2026

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.

Metrics

CVSS 4.0 8.7/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-1333

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
OpenStack	Swift	>= 1.9.1, < 2.35.4; >= 2.36.0, < 2.36.3; >= 2.37.0, < 2.37.3; 2.38.0

References

Timeline

Published: Aug 5, 2026
Last modified: Oct 24, 2026
NVD status: Awaiting Analysis

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