{"id":"CVE-2026-77422","published":"2026-09-23T19:19:15.863","lastModified":"2026-09-24T14:18:17.003","description":"JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java's backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-1333"],"vendors":[],"products":[],"references":[{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","tags":[]},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","tags":[]},{"url":"https://github.com/jline/jline3/pull/2012","tags":[]},{"url":"https://github.com/jline/jline3/pull/2018","tags":[]},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","tags":[]},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","tags":[]},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw","tags":[]},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw","tags":[]}],"exploitRefs":[{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","tags":[]},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","tags":[]},{"url":"https://github.com/jline/jline3/pull/2012","tags":[]},{"url":"https://github.com/jline/jline3/pull/2018","tags":[]},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","tags":[]},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","tags":[]},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw","tags":[]},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw","tags":[]}],"hasPoc":true,"ai":null}