Vulnerability · Published May 28, 2026 · Assigned by mitre
CVE-2026-44394
Medium 6.0
In plain English
A medium-severity incorrect authorization in Keystone from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone federated token rescoping mechanism does not propagate the original token's expiry to the newly issued token. When a federated user rescopes a token via POST /v3/auth/tokens, the handle_scoped_token() function in the mapped authentication plugin returns response data without an expires_at value. The token provider falls back to issuing a token with a fresh default TTL. By rescoping repeatedly before each token expires, a user can maintain access indefinitely, bypassing operator-configured token lifetime policies. This is a variant of CVE-2012-3426. Only deployments using federated identity (SAML2, OpenID Connect) are affected.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | keystone | 2:22.0.2-0+deb12u3 | DEBIAN-CVE-2026-44394 |
| Debian:13 | keystone | 2:27.0.0-3+deb13u4 | DEBIAN-CVE-2026-44394 |
| Debian:14 | keystone | 2:29.0.1-2 | DEBIAN-CVE-2026-44394 |
| PyPI | keystone | 27.0.2, 28.0.2, 29.0.2 | PYSEC-2026-603 |
| PyPI | keystone | 27.0.2 | GHSA-whqr-fgm5-x77q |
| PyPI | keystone | 28.0.2 | GHSA-whqr-fgm5-x77q |
| PyPI | keystone | 29.0.2 | GHSA-whqr-fgm5-x77q |
| Ubuntu:22.04:LTS | keystone | 2:21.0.1-0ubuntu2.4 | UBUNTU-CVE-2026-44394 |
| Ubuntu:24.04:LTS | keystone | 2:25.0.0-0ubuntu1.4 | UBUNTU-CVE-2026-44394 |
| Ubuntu:25.10 | keystone | 2:28.0.0-0ubuntu1.3 | UBUNTU-CVE-2026-44394 |
| Ubuntu:26.04:LTS | keystone | 2:29.0.0-0ubuntu1.2 | UBUNTU-CVE-2026-44394 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L