{"id":"CVE-2026-77421","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 nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jlin…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/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"],"patched":["org.jline:jline-builtins 4.3.1","org.jline:jline-builtins 3.30.15"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T20:17:15.777","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77421","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-ph9c-7hw9-vhhw","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-ph9c-7hw9-vhhw"}],"tags":["nvd","cve.org","ghsa","maven"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-23T19:05:07.485942Z"},"aliases":["GHSA-ph9c-7hw9-vhhw"],"ecosystem":"maven","ingestedAt":"2026-09-23T18:29:33.150Z","slug":"CVE-2026-77421","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 nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. 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.\n\n## Package advisory (CVE-2026-77421)\n\nAffected packages:\n\n- `org.jline:jline-builtins >= 4.0.0, < 4.3.1`\n- `org.jline:jline-builtins >= 3.0.0, < 3.30.15`\n\nPatched in:\n\n- `org.jline:jline-builtins 4.3.1`\n- `org.jline:jline-builtins 3.30.15`\n\nSource: https://github.com/advisories/GHSA-ph9c-7hw9-vhhw","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}