Inefficient Regular Expression Complexity Affecting jline3 package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.39% (30th percentile)

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  • Snyk IDSNYK-ECHOLATEST-JLINE3-20137983
  • published25 Sept 2026
  • disclosed23 Sept 2026

Introduced: 23 Sep 2026

NewCVE-2026-77423  (opens in a new tab)
CWE-1333  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest jline3.

NVD Description

Note: Versions mentioned in the description apply only to the upstream jline3 package and not the jline3 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1