Guzzle OAuth Subscriber has insufficient nonce entropy

{
  "id": "81976335412a00f464313134a4613cfa734ea8ceec76ae6af7f7a8126402db6a",
  "url": "https://osv.dev/vulnerability/CVE-2025-21617",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Guzzle OAuth Subscriber has insufficient nonce entropy",
    "summary": "Guzzle OAuth Subscriber signs Guzzle requests using OAuth 1.0. Prior to 0.8.1, Nonce generation does not use sufficient entropy nor a cryptographically secure pseudorandom source. This can leave servers vulnerable to replay attacks when TLS is not used. This vulnerability is fixed in 0.8.1.",
    "evidence": "osv:CVE-2025-21617",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-21617",
      "aliases": [
        "CVE-2025-21617",
        "GHSA-237r-r8m4-4q88"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/guzzle/oauth-subscriber",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "92b619b03bd21396e51c62e6bce83467d2ce8f53"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "92b619b03bd21396e51c62e6bce83467d2ce8f53"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "92b619b03bd21396e51c62e6bce83467d2ce8f53"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.8.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.8.0",
            "0.7.0",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.0",
            "0.1.2",
            "0.1.1",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21617.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.083577388Z",
      "provider": "osv",
      "references": [
        "https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192",
        "https://github.com/guzzle/oauth-subscriber/releases/tag/0.8.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21617.json",
        "https://github.com/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21617",
        "https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-338"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21617.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21617",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492392,
  "published_at": "2025-01-06T19:23:23.232+00:00"
}