https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-29485.htmlhttps://patchthecve.com/cve/CVE-2021-29485.htmlWed, 17 Jun 2026 03:47:44 +0000CRITICAL 9.9: Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a malicious attacker can achieve Remote Code Execution (RCE) via a maliciously crafted Java deserialization gadget chain leveraged against the Ratpack session store. If one's application does not use Ratpack's session mehttps://patchthecve.com/cve/CVE-2021-29481.htmlhttps://patchthecve.com/cve/CVE-2021-29481.htmlWed, 17 Jun 2026 03:47:43 +0000MEDIUM 6.5: Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, the default configuration of client side sessions results in unencrypted, but signed, data being set as cookie values. This means that if something sensitive goes into the session, it could be read by something with accehttps://patchthecve.com/cve/CVE-2021-29480.htmlhttps://patchthecve.com/cve/CVE-2021-29480.htmlWed, 17 Jun 2026 03:47:43 +0000MEDIUM 4.4: Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, the client side session module uses the application startup time as the signing key by default. This means that if an attacker can determine this time, and if encryption is not also used (which is recommended, but is nothttps://patchthecve.com/cve/CVE-2021-29479.htmlhttps://patchthecve.com/cve/CVE-2021-29479.htmlWed, 17 Jun 2026 03:47:43 +0000HIGH 7.0: Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a user supplied `X-Forwarded-Host` header can be used to perform cache poisoning of a cache fronting a Ratpack server if the cache key does not include the `X-Forwarded-Host` header as a cache key. Users are only vulnerahttps://patchthecve.com/cve/CVE-2019-17513.htmlhttps://patchthecve.com/cve/CVE-2019-17513.htmlWed, 17 Jun 2026 02:24:02 +0000HIGH 7.5: An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with Ratpack, HTTP Response Splitting can occur.https://patchthecve.com/cve/CVE-2019-11808.htmlhttps://patchthecve.com/cve/CVE-2019-11808.htmlWed, 17 Jun 2026 02:13:39 +0000LOW 3.7: 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.