CVE-2026-97149: Openstack Swift

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

In OpenStack Swift before 2.38.2, the tempurl middleware does not reject the X-Copy-From header on PUT requests. A TempURL signature only covers the method, expiry, and path, and thus the list of disallowed headers is the only defense against a signed PUT request changing what the request does. An attacker holding a PUT TempURL for a single object can add an X-Copy-From header naming any object in the same account; the copy middleware copies that object to the destination, and the attacker then reads the victim's data back with a GET TempURL for the destination object. Copies across account boundaries are rejected. Only deployments using the shipped default proxy pipeline (tempurl and copy middleware) with account-level TempURL keys are affected.

Affected products

• Openstack Swift: from 2.4.0, before 2.35.5 (fixed in 2.35.5); from 2.36.0, before 2.36.4 (fixed in 2.36.4); from 2.37.0, before 2.37.4 (fixed in 2.37.4); from 2.38.0, before 2.38.2 (fixed in 2.38.2)

Published 2026-09-24. Last modified 2026-10-06.