CVE-2026-77423

HIGH 7.5

JLine: ReDoS in Built-in Less Viewer Search

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.

CWE	CWE-1333
Vendor	jline
Product	jline3
Published	Sep 23, 2026

Stay Ahead of the Next One

Get instant alerts for jline jline3

Be the first to know when new high vulnerabilities affecting jline jline3 are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

jline / jline3

>= 3.0.0, < 3.30.15 >= 4.0.0, < 4.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx 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/commit/1d5fc3099e77938b971e197211cad2d4fbb17541 github.com: https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae 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