JLine: ReDoS in Built-in grep Command Amplified by Automatic `.*` Wrapping

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77422
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 19:19:15 UTC
Updated2026-09-24 14:18:17 UTC
DescriptionJLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java's backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/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]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/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-r2xf-8xr9-62gw 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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