CVE-2026-71192 Missing authorization in Swift
Attackers can bypass authorization to read private objects from other tenants by injecting Swift-native headers into S3 API requests when s3_acl is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71192?
CVE-2026-71192 is a medium-severity missing authorization vulnerability in OpenStack Swift, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In OpenStack Swift through 2.38.0, the S3API middleware does not sanitize Swift-native control headers (X-Copy-From, X-Copy-From-Account) from S3 API requests when s3_acl=true. An attacker can inject these headers into a signed PUT request targeting their own bucket, causing Swift to perform a server-side copy from another tenant's private object. The source object authorization is bypassed because the S3API middleware has already authorized the request against the destination. The attacker can read any object whose project_id, container name, and object name are known, regardless of the source object's ACLs or ownership. This requires the non-default s3_acl=true configuration.
Weakness: CWE-863
Which versions are affected by CVE-2026-71192?
How do I fix CVE-2026-71192?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-71192 being exploited?
There is no known exploitation of CVE-2026-71192 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-71192, GHSA-6p2v-36c6-f6m5, UBUNTU-CVE-2026-71192.