CVE-2026-77420
Description
JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, DefaultHistory.matchPatterns(String patterns, String line) in reader/src/main/java/org/jline/reader/impl/history/DefaultHistory.java converts the HISTORY_IGNORE configuration value into a Java regular expression while escaping only part of its syntax, allowing other regex metacharacters to reach the backtracking engine. An attacker who can control application or user configuration can supply a nested-quantifier expression that is reevaluated whenever a command is added to history, consuming excessive CPU and indefinitely blocking the reader thread. This issue is fixed in versions 3.30.15 and 4.3.1.
How to fix
- org.jline:jline-reader4.3.1, 3.30.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.jline:jline-readerMaven | 4.0.0 ≤ v < 4.3.1, 3.0.0 ≤ v < 3.30.15 | 4.3.1, 3.30.15 |
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