CVE-2026-77420

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-112901 Pillow is a Python imaging library. CWE-1333
• CVE-2026-106454 Twisted is an event-based framework for internet applications, supporting Python 3.6+. CWE-1333
• CVE-2026-77387 geopy is a geocoding library for Python. CWE-1333
• CVE-2026-102990 basic-ftp is an FTP client for Node.js. CWE-1333
• CVE-2026-102473 A flaw was found in dash. CWE-1333
• CVE-2026-102270 PyJWT is a Python implementation of JSON Web Token standards. CWE-1333
• CVE-2026-101906 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1333
• CVE-2026-101903 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1333