python-keycloak — security advisory

{
  "id": "0273ed18f44cc905f17fcc41229f315e5ea1fd3df3a958bca7977113273c4ddc",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-1035",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-1035",
    "summary": "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.",
    "evidence": "osv:UBUNTU-CVE-2026-1035",
    "products": [
      {
        "name": {
          "value": "python-keycloak",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.3.0+dfsg-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.9.0+dfsg-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-keycloak",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.3.1+dfsg-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-keycloak",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.7.0+dfsg-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "low",
    "structured": {
      "id": "UBUNTU-CVE-2026-1035",
      "aliases": [
        "UBUNTU-CVE-2026-1035"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-keycloak",
            "purl": "pkg:deb/ubuntu/python-keycloak?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "3.3.0+dfsg-2",
            "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"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-keycloak",
                "binary_version": "3.9.0+dfsg-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-keycloak",
            "purl": "pkg:deb/ubuntu/python-keycloak?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "5.3.1+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1035.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-keycloak",
                "binary_version": "5.3.1+dfsg-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "python-keycloak",
            "purl": "pkg:deb/ubuntu/python-keycloak?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "5.7.0+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1035.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-keycloak",
                "binary_version": "5.7.0+dfsg-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:57:58.196718335Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-1035"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-1035",
        "https://www.cve.org/CVERecord?id=CVE-2026-1035",
        "https://access.redhat.com/security/cve/CVE-2026-1035",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2430314"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-1035",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 357793,
  "published_at": "2026-01-21T06:15:00+00:00"
}