High
swift — security advisory
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.
- Products
- swift
- Affected versions
- 2.15.1-0ubuntu3, 2.16.0-0ubuntu1, 2.16.0-0ubuntu2, 2.17.0-0ubuntu1, 2.17.1-0ubuntu1, 2.23.0-0ubuntu1, 2.23.1-0ubuntu1, 2.24.0-0ubuntu1, 2.24.0~git2019121715.e890b0f0f-0ubuntu1, 2.24.1~git2020032711.712bf3c9f-0ubuntu2, 2.24.1~git2020041316.a495f1e32-0ubuntu1, 2.25.0-0ubuntu0.20.04.1, 2.25.1-0ubuntu1, 2.25.2-0ubuntu1, 2.25.2-0ubuntu1.1, 2.28.0+git2021090911.5d52afbe4-0ubuntu1, 2.28.0+git2021120815.1859f2e16-0ubuntu1, 2.28.0+git2021121320.876377435-0ubuntu1, 2.28.0+git2022011309.32da73f5c-0ubuntu1, 2.29.0+git2022030314.3ff3076ce-0ubuntu1, 2.29.0+git2022030314.3ff3076ce-0ubuntu2, 2.29.1-0ubuntu1, 2.29.2-0ubuntu1, 2.29.2-0ubuntu1.1, 2.32.0+git2023090714.8ce961ed-0ubuntu1, 2.32.0+git2024021508.3aba22fd-0ubuntu1, 2.32.0+git2024030809.4135133a-0ubuntu1, 2.33.0-0ubuntu1, 2.33.0-0ubuntu1.1, 2.36.0-0ubuntu1, 2.37.0-0ubuntu1, 2.37.1-0ubuntu2, 2.37.1-0ubuntu2.1, 2.38.0+git20260812.91.3064444-0ubuntu1, 2.38.1-0ubuntu1, 2.38.2-0ubuntu1, 2.5.0-0ubuntu1, 2.7.0-0ubuntu2, 2.7.0-0ubuntu2.1, 2.7.1-0ubuntu1, 2.7.1-0ubuntu2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-71190
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:14 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-71190
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
swift
Fixed versions: Not specified
Complete source record
{
"id": "cf6e33f135ce98d5538cea4272e6bcd0fb331a9109583ecfd5719fe893a0a73a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-71190",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-71190",
"summary": "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.",
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],
"modified": "2026-10-17T13:00:44.890289436Z",
"provider": "osv",
"upstream": [
"CVE-2026-71190"
],
"references": [
"https://ubuntu.com/security/CVE-2026-71190",
"https://www.cve.org/CVERecord?id=CVE-2026-71190",
"https://security.openstack.org/ossa/OSSA-2026-031.html",
"https://bugs.launchpad.net/swift/+bug/2158771",
"https://launchpad.net/bugs/2158771",
"https://openwall.com/lists/oss-security/2026/07/28/27"
]
},
"related_cves": [
{
"value": "CVE-2026-71190",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360811,
"published_at": "2026-08-05T06:16:00+00:00"
}