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EUVD-2026-209217

fkie_cve-2025-21617

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.

GHSA-237r-r8m4-4q88 — Guzzle OAuth Subscriber has insufficient nonce entropy

Affected: Packagist: guzzlehttp/oauth-subscriber

### Impact

Nonce 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.

### Patches

Upgrade to version 0.8.1 or higher.

### Workarounds

No.

### References

Issue is similar to https://nvd.nist.gov/vuln/detail/CVE-2025-22376.