GHSA-237r-r8m4-4q88

Guzzle OAuth Subscriber has insufficient nonce entropy

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-21617

Packages

Ecosystem	Package	Affected	Fixed in
Packagist	guzzlehttp/oauth-subscriber	< 0.8.1	0.8.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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.

References

External links from the advisory. They lead to third-party sites.

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