CVE-2026-71191

In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration.

CVSS

No CVSS.

References

Link	Resource
https://launchpad.net/bugs/2158733
https://openwall.com/lists/oss-security/2026/07/28/26
https://security.openstack.org/ossa/OSSA-2026-030.html

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-05 06:16

Updated : 2026-09-09 16:03

NVD link : CVE-2026-71191

Mitre link : CVE-2026-71191

CVE.ORG link : CVE-2026-71191

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

{"id": "CVE-2026-71191", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71191", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-06T13:10:29.357812Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.0, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"repo": "https://opendev.org/openstack/swift", "vendor": "OpenStack", "product": "Swift", "versions": [{"status": "affected", "version": "2.18.0", "lessThan": "2.35.4", "versionType": "semver"}, {"status": "affected", "version": "2.36.0", "lessThan": "2.36.3", "versionType": "semver"}, {"status": "affected", "version": "2.37.0", "lessThan": "2.37.3", "versionType": "semver"}, {"status": "affected", "version": "2.38.0", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-05T06:16:40.180", "references": [{"url": "https://launchpad.net/bugs/2158733", "source": "cve@mitre.org"}, {"url": "https://openwall.com/lists/oss-security/2026/07/28/26", "source": "cve@mitre.org"}, {"url": "https://security.openstack.org/ossa/OSSA-2026-030.html", "source": "cve@mitre.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz-* headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy from an arbitrary source object using the signer's authorization context. The attacker can read any object the signer has access to, provided the target project_id, container name, and object name are known. This affects all deployments using the default s3_acl=false configuration."}], "lastModified": "2026-09-09T16:03:22.897", "sourceIdentifier": "cve@mitre.org"}