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JLine: ReDoS in Built-in Less Viewer Search

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, 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.

Announced Source revision 1
Original source ↗

CVE-2026-77423

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-2026-77423

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-2026-77423

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

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