CVE-2026-77421
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.
How to fix
- org.jline:jline-builtins4.3.1, 3.30.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.jline:jline-builtinsMaven | 4.0.0 ≤ v < 4.3.1, 3.0.0 ≤ v < 3.30.15 | 4.3.1, 3.30.15 |
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