UBUNTU-CVE-2026-1035

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Source

https://ubuntu.com/security/CVE-2026-1035

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1035.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-1035

Upstream

CVE-2026-1035

Published

2026-01-21T06:15:00Z

Modified

2026-01-21T18:30:02.025451Z

Severity

3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw was found in the Keycloak server during refresh token processing, specifically in the TokenManager class responsible for enforcing refresh token reuse policies. When strict refresh token rotation is enabled, the validation and update of refresh token usage are not performed atomically. This allows concurrent refresh requests to bypass single-use enforcement and issue multiple access tokens from the same refresh token. As a result, Keycloak’s refresh token rotation hardening can be undermined.

References

Affected packages

Ubuntu:24.04:LTS / python-keycloak

Package

Name: python-keycloak
Purl: pkg:deb/ubuntu/python-keycloak@3.9.0+dfsg-1?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.3.0+dfsg-2

3.9.0+dfsg-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-keycloak",
            "binary_version": "3.9.0+dfsg-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1035.json"

Ubuntu:25.10 / python-keycloak