MEDIUM

GHSA-237r-r8m4-4q88

Guzzle OAuth Subscriber has insufficient nonce entropy

Details

### 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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Packagist / guzzlehttp/oauth-subscriber

Introduced in: 0 Fixed in: 0.8.1

Fix composer require guzzlehttp/oauth-subscriber:^0.8.1

References

https://github.com/guzzle/oauth-subscriber/security/advisories/GHSA-237r-r8m4-4q88 [WEB]
https://nvd.nist.gov/vuln/detail/CVE-2025-21617 [ADVISORY]
https://github.com/guzzle/oauth-subscriber/commit/92b619b03bd21396e51c62e6bce83467d2ce8f53 [WEB]
https://github.com/FriendsOfPHP/security-advisories/blob/master/guzzlehttp/oauth-subscriber/CVE-2025-21617.yaml [WEB]
https://github.com/guzzle/oauth-subscriber [PACKAGE]
https://github.com/guzzle/oauth-subscriber/blob/0.8.0/src/Oauth1.php#L192 [WEB]
https://github.com/guzzle/oauth-subscriber/releases/tag/0.8.1 [WEB]