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Vulnerability · Published Aug 5, 2026 · Assigned by mitre

CVE-2026-71191

Medium 6.0

In plain English

A medium-severity incorrect authorization in Swift from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium
Exploit odds (30 days)0.6%top 52.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12swift2.30.1-0+deb12u3DEBIAN-CVE-2026-71191
Debian:13swift2.35.1-0+deb13u3DEBIAN-CVE-2026-71191
Debian:14swift2.37.1-6DEBIAN-CVE-2026-71191
Ubuntu:22.04:LTSswiftno fix listedUBUNTU-CVE-2026-71191
Ubuntu:24.04:LTSswiftno fix listedUBUNTU-CVE-2026-71191
Ubuntu:26.04:LTSswiftno fix listedUBUNTU-CVE-2026-71191
Ubuntu:26.10swiftno fix listedUBUNTU-CVE-2026-71191

Affected products (as reported)

VendorProductVersions
OpenStack Swift 2.18.0 – before 2.35.42.36.0 – before 2.36.32.37.0 – before 2.37.32.38.0

Weakness: CWE-863 · Vector: 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

References