{"id":"CVE-2025-21617","aliases":["GHSA-237r-r8m4-4q88"],"url":"https://o3.security/vulnerability/CVE-2025-21617","summary":"Guzzle OAuth Subscriber has insufficient nonce entropy","details":"### Impact\n\nNonce generation does not use sufficient entropy nor a cryptographically secure pseudorandom source (https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192). This can leave servers vulnerable to replay attacks when TLS is not used.\n\n### Patches\n\nUpgrade to version 0.8.1 or higher.\n\n### Workarounds\n\nNo.\n\n### References\n\nIssue is similar to https://nvd.nist.gov/vuln/detail/CVE-2025-22376.","published":"2025-01-06T19:23:23.232Z","modified":"2026-08-12T03:51:11.591748801Z","cvss":null,"epss":{"score":0.00459,"percentile":0.38216,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"guzzlehttp/oauth-subscriber","fixedVersion":"0.8.1"}],"fix":{"url":"https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53","label":"guzzle/oauth-subscriber@92b619b"},"references":[{"type":"WEB","url":"https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192"},{"type":"WEB","url":"https://github.com/guzzle/oauth-subscriber/releases/tag/0.8.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21617.json"},{"type":"ADVISORY","url":"https://github.com/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21617"},{"type":"FIX","url":"https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/oauth-subscriber/CVE-2025-21617.yaml"},{"type":"PACKAGE","url":"https://github.com/guzzle/oauth-subscriber"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:11.591748801Z"}}