{"id":"CVE-2019-11808","details":"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.","aliases":["GHSA-54mg-vgrp-mwx9"],"modified":"2026-07-08T15:55:06.570460Z","published":"2019-05-07T07:29:05.167Z","references":[{"type":"ADVISORY","url":"https://github.com/ratpack/ratpack/releases/tag/v1.6.1"},{"type":"FIX","url":"https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d"},{"type":"FIX","url":"https://github.com/ratpack/ratpack/issues/1448"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ratpack/ratpack","events":[{"introduced":"0"},{"fixed":"11b87db977532b57298c223e4ec82854071b6c20"},{"fixed":"f2b63eb82dd71194319fd3945f5edf29b8f3a42d"}],"database_specific":{"cpe":"cpe:2.3:a:ratpack_project:ratpack:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.6.1"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v1.6.0","v1.6.0-rc-4","v1.6.0-rc-3","v1.6.0-rc-2","1.6.0-rc-1","v1.5.0","v1.5.0-rc-3","v1.5.0-rc-1","v1.4.0","v1.4.0-rc-3","v1.4.0-rc-2","v1.4.0-rc-1","v1.3.1","v1.3.0","v1.3.0-rc-2","v1.3.0-rc-1","v1.2.0","v1.2.0-rc-2","v1.2.0-RC-1","v1.1.1","v1.1.0","v1.0.0","v1.0.0-rc-3","v1.0.0-rc-2","v1.0.0-rc-1","v0.9.19","v0.9.18","v0.9.17","v0.9.16","v0.9.15","v0.9.14","v0.9.13","v0.9.12","v0.9.11","v0.9.10","v0.9.9","v0.9.8","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","0.6.1","0.5.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-11808.json","vanir_signatures_modified":"2026-07-08T15:55:06Z","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d","target":{"file":"ratpack-session/src/main/java/ratpack/session/SessionModule.java"},"deprecated":false,"digest":{"line_hashes":["71367211667805614474262679484365507025","154913202557657715797989884372491816929","203145417490335592114016916057217824295","77552764402514804693061393479611006934"],"threshold":0.9},"id":"CVE-2019-11808-078847f3"},{"signature_type":"Line","signature_version":"v1","source":"https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d","target":{"file":"ratpack-session/src/main/java/ratpack/session/internal/DefaultSessionIdGenerator.java"},"deprecated":false,"digest":{"line_hashes":["223769642921180714213624975815823092972","270234634705521122023414332419619368198","192011128202987122063634888260665579081","117400372187328187914271744312200082874","99069651121528590450252327565252769957","305049644449210423698307830915945668901","196581739354092496730175082181381076825","244116176367642181748269931645136646689","300381473656706452809181982359708873149"],"threshold":0.9},"id":"CVE-2019-11808-0fc3d6e1"},{"signature_type":"Function","signature_version":"v1","source":"https://github.com/ratpack/ratpack/commit/f2b63eb82dd71194319fd3945f5edf29b8f3a42d","target":{"file":"ratpack-session/src/main/java/ratpack/session/internal/DefaultSessionIdGenerator.java","function":"generateSessionId"},"deprecated":false,"digest":{"function_hash":"207315375411098578483848171294891764207","length":174},"id":"CVE-2019-11808-4ea60d16"}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}