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JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-77420

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-77420

jline3

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "jline",
    "product": "jline3",
    "versions": [
      {
        "status": "affected",
        "version": ">= 3.0.0, < 3.30.15"
      },
      {
        "status": "affected",
        "version": ">= 4.0.0, < 4.3.1"
      }
    ]
  }
]
Related CVEs
CVE-2026-77420

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#3364 · Revision 1
Added to Heist Feed
Publisher date
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