usn-8065-1
Vulnerability from osv_ubuntu
Published
2026-02-25 20:43
Modified
2026-04-27 14:11
Summary
python-authlib vulnerabilities
Details

Millie Solem discovered that Authlib did not properly restrict algorithm selection during JWT verification, allowing HMAC verification with asymmetric public keys when no algorithm was specified. A remote attacker could possibly use this issue to bypass signature verification and forge tokens, resulting in authentication bypass or privilege escalation. (CVE-2024-37568)

Muhammad Noman Ilyas discovered that Authlib did not properly enforce critical header parameter handling during JSON Web Signature verification, leading to unknown critical parameters being incorrectly accepted. A remote attacker could possibly use this issue to bypass security policies in mixed deployments, resulting in authentication bypass, replay attacks, or privilege escalation. (CVE-2025-59420)

Muhammad Noman Ilyas discovered that Authlib did not properly limit the size of JSON Web Signature or JSON Web Token header and signature segments. A remote attacker could possibly use this issue to cause excessive memory or processor consumption, leading to a denial of service. (CVE-2025-61920)

Muhammad Noman Ilyas discovered that Authlib performed unbounded decompression when processing certain compressed encrypted tokens. A remote attacker could possibly use this issue to send a specially crafted token that can be expanded to a large size during decompression, causing a denial of service. (CVE-2025-62706)

It was discovered that Authlib did not properly bind cached state information to the initiating user session during OAuth authentication flows. A remote attacker could possibly use this issue to perform cross- site request forgery attacks, resulting in unauthorized actions or authentication bypass. This issue only affected Ubuntu 24.04 LTS. (CVE-2025-68158)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2024-37568",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-59420",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-61920",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-62706",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python3-authlib",
            "binary_version": "0.15.5-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "python-authlib",
        "purl": "pkg:deb/ubuntu/python-authlib@0.15.5-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.15.5-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.15.4-1",
        "0.15.5-1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2024-37568",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-59420",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-61920",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-62706",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-68158",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python3-authlib",
            "binary_version": "1.3.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "python-authlib",
        "purl": "pkg:deb/ubuntu/python-authlib@1.3.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.0-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.1-1",
        "1.3.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Millie Solem discovered that Authlib did not properly restrict algorithm\nselection during JWT verification, allowing HMAC verification with\nasymmetric public keys when no algorithm was specified. A remote attacker\ncould possibly use this issue to bypass signature verification and forge\ntokens, resulting in authentication bypass or privilege escalation.\n(CVE-2024-37568)\n\nMuhammad Noman Ilyas discovered that Authlib did not properly enforce\ncritical header parameter handling during JSON Web Signature verification,\nleading to unknown critical parameters being incorrectly accepted. A remote\nattacker could possibly use this issue to bypass security policies in mixed\ndeployments, resulting in authentication bypass, replay attacks, or\nprivilege escalation. (CVE-2025-59420)\n\nMuhammad Noman Ilyas discovered that Authlib did not properly limit the\nsize of JSON Web Signature or JSON Web Token header and signature segments.\nA remote attacker could possibly use this issue to cause excessive memory\nor processor consumption, leading to a denial of service. (CVE-2025-61920)\n\nMuhammad Noman Ilyas discovered that Authlib performed unbounded\ndecompression when processing certain compressed encrypted tokens. A remote\nattacker could possibly use this issue to send a specially crafted token\nthat can be expanded to a large size during decompression, causing a denial\nof service. (CVE-2025-62706)\n\nIt was discovered that Authlib did not properly bind cached state\ninformation to the initiating user session during OAuth authentication\nflows. A remote attacker could possibly use this issue to perform cross-\nsite request forgery attacks, resulting in unauthorized actions or\nauthentication bypass. This issue only affected Ubuntu 24.04 LTS.\n(CVE-2025-68158)",
  "id": "USN-8065-1",
  "modified": "2026-04-27T14:11:49Z",
  "published": "2026-02-25T20:43:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8065-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-37568"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-59420"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-61920"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-62706"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-68158"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "python-authlib vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2024-37568",
    "UBUNTU-CVE-2025-59420",
    "UBUNTU-CVE-2025-61920",
    "UBUNTU-CVE-2025-62706",
    "UBUNTU-CVE-2025-68158"
  ]
}



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