ubuntu-cve-2026-54430
Vulnerability from osv_ubuntu
Published
2026-07-02 11:16
Modified
2026-07-09 15:21
Summary
Details

liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0

Severity
5.1 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liboauth2-0",
            "binary_version": "1.4.4-1"
          },
          {
            "binary_name": "liboauth2-apache0",
            "binary_version": "1.4.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "liboauth2",
        "purl": "pkg:deb/ubuntu/liboauth2@1.4.4-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0.1-1",
        "1.4.3.2-1",
        "1.4.3.2-2",
        "1.4.3.2-3",
        "1.4.3.2-3ubuntu1",
        "1.4.3.2-4",
        "1.4.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liboauth2-0",
            "binary_version": "1.6.0-1build4"
          },
          {
            "binary_name": "liboauth2-apache0",
            "binary_version": "1.6.0-1build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "liboauth2",
        "purl": "pkg:deb/ubuntu/liboauth2@1.6.0-1build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.1-3",
        "1.5.2-1",
        "1.6.0-1",
        "1.6.0-1build1",
        "1.6.0-1build3",
        "1.6.0-1build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liboauth2-0",
            "binary_version": "2.1.0-2"
          },
          {
            "binary_name": "liboauth2-apache0",
            "binary_version": "2.1.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "liboauth2",
        "purl": "pkg:deb/ubuntu/liboauth2@2.1.0-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-1",
        "2.1.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liboauth2-1",
            "binary_version": "2.2.0-2ubuntu1"
          },
          {
            "binary_name": "liboauth2-apache1",
            "binary_version": "2.2.0-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "liboauth2",
        "purl": "pkg:deb/ubuntu/liboauth2@2.2.0-2ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-2",
        "2.1.1-1",
        "2.2.0-1",
        "2.2.0-2ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "liboauth2 is vulnerable to Server-Side Request Forgery in\u00a0oauth2_jose_jwks_aws_alb_resolve() function.\u00a0The AWS ALB verifier reads both signer and kid from the unverified JWT header. If signer matches the configured ARN, kid is appended to alb_base_url without URL encoding or path sanitization, and the HTTP GET is issued before signature verification. This allows an attacker to force the server to send a GET request to an attacker-chosen internal path. This issue was fixed in version 2.3.0",
  "id": "UBUNTU-CVE-2026-54430",
  "modified": "2026-07-09T15:21:03Z",
  "published": "2026-07-02T11:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-54430"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-54430"
    },
    {
      "type": "REPORT",
      "url": "https://cert.pl/en/posts/2026/07/CVE-2026-54430"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenIDC/liboauth2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-54430"
  ]
}



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