CVE-2026-71190

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.

Database specific

{
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71190.json",
    "cwe_ids": [
        "CWE-1333"
    ],
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "1.9.1"
                },
                {
                    "fixed": "2.35.4"
                },
                {
                    "introduced": "2.36.0"
                },
                {
                    "fixed": "2.36.3"
                },
                {
                    "introduced": "2.37.0"
                },
                {
                    "fixed": "2.37.3"
                }
            ]
        }
    ]
}

References

Affected packages

Git / opendev.org/openstack/swift

Affected ranges

Type

GIT

Repo

https://opendev.org/openstack/swift

Events

Introduced

9f5881d5143fd06a328bde2713cd9c61df579289

Last affected

9f5881d5143fd06a328bde2713cd9c61df579289

Database specific

{
    "extracted_events": [
        {
            "introduced": "2.38.0"
        },
        {
            "last_affected": "2.38.0"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

2.*

2.38.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71190.json"