JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77420
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 19:19:15 UTC
Updated2026-09-23 19:19:15 UTC
DescriptionJLine 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-1333 | CWE-1333 CWE-1333: Inefficient Regular Expression Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jline Jline3 affected >= 3.0.0, < 3.30.15 Not specified
CNA Jline Jline3 affected >= 4.0.0, < 4.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/jline/jline3/pull/2012 [email protected] github.com
github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541 [email protected] github.com
github.com/jline/jline3/pull/2018 [email protected] github.com
github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae [email protected] github.com
github.com/jline/jline3/releases/tag/4.3.1 [email protected] github.com
github.com/jline/jline3/releases/tag/jline-3.30.15 [email protected] github.com
github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3 [email protected] github.com
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