{"id":"CVE-2026-77423","aliases":["DEBIAN-CVE-2026-77423","EUVD-2026-85531","GHSA-2v9w-34q6-wpqx","UBUNTU-CVE-2026-77423"],"status":"published","title":"JLine: ReDoS in Built-in Less Viewer Search","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00461,"percentile":0.40281,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1333"],"published":"2026-09-23T18:17:49Z","modified":"2026-10-28T11:17:53Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-3","3.3.1-4","3.3.1-5"]},{"source":"osv","ecosystem":"Debian:13","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-4","3.3.1-5"]},{"source":"osv","ecosystem":"Debian:14","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-4","3.3.1-5"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-2"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11-1","2.11-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11-4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11-4","2.12.1-1","2.14.6-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.6-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.6-4"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.6-5"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-3","3.3.1-3ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-3build1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.6-6"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-4build1","3.3.1-5"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"jline","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0-3","1.0-3build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"jline2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.6-6"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"jline3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-4","3.3.1-4build1"]}],"products":[{"vendor":"jline","product":"jline3"}],"references":[{"url":"https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx","tags":["x_refsource_CONFIRM","exploit","advisory","report"]},{"url":"https://github.com/jline/jline3/pull/2012","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/jline/jline3/pull/2018","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77423.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77423","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77423","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-77423","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77423","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-77423","title":"JLine: ReDoS in Built-in Less Viewer Search","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T18:17:49.635Z","modified":"2026-09-24T14:10:52.736Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:20:15.712761Z"}],"euvd":[{"id":"EUVD-2026-85531","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T18:17:49Z","modified":"2026-09-24T14:10:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:27:58.638653Z"}],"nvd":[{"id":"CVE-2026-77423","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T19:19:16.017Z","modified":"2026-09-30T16:44:39.84Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:50.703874Z"}],"osv":[{"id":"CVE-2026-77423","title":"JLine: ReDoS in Built-in Less Viewer Search","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T18:17:49.635Z","modified":"2026-10-28T11:17:53.068058895Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:45:17.102988Z"},{"id":"DEBIAN-CVE-2026-77423","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T19:19:16.017Z","modified":"2026-10-01T08:47:42.63795966Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:03.502256Z"},{"id":"UBUNTU-CVE-2026-77423","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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.","status":"published","published":"2026-09-23T19:19:00Z","modified":"2026-10-17T13:01:09.20688163Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:18.015985Z"}]}}