What’s Vulnerable › Vulnerabilities

CVE-2019-11808

• Severity: low (CVSS 3.7 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-05-07 · updated 2026-06-17
• Weakness: CWE-338

Description

Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLocalRandom. This means that if an attacker can determine a small window for the server start time and obtain a session ID value, they can theoretically determine the sequence of session IDs.

Affected products

• ratpack: before 1.6.1 — fixed in 1.6.1

How to fix

Upgrade to a fixed version: ratpack 1.6.1. Check the vendor advisory for mitigations.

References

• https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d
• https://github.com/ratpack/ratpack/issues/1448
• https://github.com/ratpack/ratpack/releases/tag/v1.6.1
• https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d
• https://github.com/ratpack/ratpack/issues/1448
• https://github.com/ratpack/ratpack/releases/tag/v1.6.1

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