{"id":"CVE-2026-77423","title":"JLine is a Java library for handling console input","summary":"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/ma…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1333"],"vendor":"jline","product":"jline3","affected":["jline3 >= 3.0.0, < 3.30.15","jline3 >= 4.0.0, < 4.3.1"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:16.017","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77423","references":[{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/pull/2012","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/pull/2018","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-23T19:31:04.467Z","slug":"CVE-2026-77423","body":"## Overview\n\nJLine 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}