MEDIUM
GHSA-237r-r8m4-4q88
Guzzle OAuth Subscriber has insufficient nonce entropy
Quick fix
GHSA-237r-r8m4-4q88 — guzzlehttp/oauth-subscriber: upgrade to the fixed version with the command below.
composer require guzzlehttp/oauth-subscriber:^0.8.1Details
### 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:
0Fixed in: 0.8.1Fix
composer require guzzlehttp/oauth-subscriber:^0.8.1References
- 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]