CVEvulnerability
CVE-2026-77420
5.5 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-09-23
- Last modified
- 2026-09-30
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-1333
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.
Related
Weakness · CWE (1)
- CWE-1333 Inefficient Regular Expression Complexity weakness
References
- https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541 github.com
- https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae github.com
- https://github.com/jline/jline3/pull/2012 github.com
- https://github.com/jline/jline3/pull/2018 github.com
- https://github.com/jline/jline3/releases/tag/4.3.1 github.com
- https://github.com/jline/jline3/releases/tag/jline-3.30.15 github.com
- https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3 github.com
- https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3 github.com