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[ CVE-2026-77421 · Published 23 Sep 2026 ]

JLine: ReDoS in Nano Editor Regex Search Mode

CVSS 6.5 EPSS <1%Fix available

[ Description ]Official 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 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.

[ Fixes ]Fixes and patches

  • org.jline:jline-builtins 4.3.1Fixed version · GitHub Advisories · maven package org.jline:jline-builtins: upgrade to 4.3.1 or later (affected >= 4.0.0, < 4.3.1)
  • org.jline:jline-builtins 3.30.15Fixed version · GitHub Advisories · maven package org.jline:jline-builtins: upgrade to 3.30.15 or later (affected >= 3.0.0, < 3.30.15)

[ Packages ]Affected open-source packages

  • org.jline:jline-builtins mavenAffected >= 4.0.0, < 4.3.1 · fixed in 4.3.1 · GHSA-ph9c-7hw9-vhhw
  • org.jline:jline-builtins mavenAffected >= 3.0.0, < 3.30.15 · fixed in 3.30.15 · GHSA-ph9c-7hw9-vhhw

[ References ]References