What’s Vulnerable › Vulnerabilities

CVE-2025-40905: WWW::OAuth 1.000 and earlier for Perl uses insecure rand() function for cryptographic functions

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-13 · updated 2026-06-17
• Weakness: CWE-338

Description

WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

Affected products

• DBOOK Www::Oauth: through 1.000

References

• https://metacpan.org/release/DBOOK/WWW-OAuth-1.000/source/lib/WWW/OAuth.pm#L86
• https://perldoc.perl.org/functions/rand
• https://security.metacpan.org/docs/guides/random-data-for-security.html
• http://www.openwall.com/lists/oss-security/2026/02/13/1

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