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CVE-2026-77420— JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable

Quick assessment

Affected
jline jline3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 configurati

CVSS 5.5 · Medium EPSS 0.12% · P2

Affected Version Matrix 2

VendorProduct Version RangeStatus
jline jline3 >= 3.0.0, < 3.30.15 affected
>= 4.0.0, < 4.3.1 affected
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I. Basic Information for CVE-2026-77420

Vulnerability Information

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Vulnerability Title
JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jline jline3 >= 3.0.0, < 3.30.15 -

II. Public POCs for CVE-2026-77420

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III. Intelligence Information for CVE-2026-77420

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Patches & Fixes for CVE-2026-77420 (4)

Other References for CVE-2026-77420 (3)

Same Patch Batch · jline · 2026-09-23 · 4 CVEs total

CVE-2026-77422 7.5 HIGH JLine: ReDoS in Built-in grep Command Amplified by Automatic `.*` Wrapping
CVE-2026-77423 7.5 HIGH JLine: ReDoS in Built-in Less Viewer Search
CVE-2026-77421 6.5 MEDIUM JLine: ReDoS in Nano Editor Regex Search Mode

IV. Related Vulnerabilities

Same product: jline3
Same vendor: jline
Same weakness: CWE-1333

V. Comments for CVE-2026-77420

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