What’s Vulnerable › Vulnerabilities

CVE-2021-3990: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in star7th/showdoc

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-01 · updated 2026-06-17
• Weakness: CWE-338

Description

showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Affected products

• star7th/showdoc: before 2.9.13 — fixed in 2.9.13

How to fix

Upgrade to a fixed version: star7th/showdoc 2.9.13. Check the vendor advisory for mitigations.

References

• https://github.com/star7th/showdoc/commit/a9886f26c08225e0adca75c67dfca3f7c42b87d0
• https://huntr.dev/bounties/0680067d-56a7-4412-b06e-a267e850ae9f
• https://github.com/star7th/showdoc/commit/a9886f26c08225e0adca75c67dfca3f7c42b87d0
• https://huntr.dev/bounties/0680067d-56a7-4412-b06e-a267e850ae9f

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