Unrated

DEBIAN-CVE-2026-77421

Type: advisorySource: OSV1 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 nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.

Announced 23 Sept 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-77421

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: osv:DEBIAN-CVE-2026-77421

jline3

Source reference: /affected/0/package/name

Affected versions: 3.3.1-3
Source reference: /affected/0/versions
3.3.1-4
Source reference: /affected/0/versions
3.3.1-5
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline3

Source reference: /affected/1/package/name

Affected versions: 3.3.1-4
Source reference: /affected/1/versions
3.3.1-5
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

jline3

Source reference: /affected/2/package/name

Affected versions: 3.3.1-4
Source reference: /affected/2/versions
3.3.1-5
Source reference: /affected/2/versions
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.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.3.1-3",
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77421.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77421.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "jline3",
      "purl": "pkg:deb/debian/jline3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.3.1-4",
      "3.3.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77421.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #59425 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 18:28:52 GMT
Publisher date: Wed, 23 Sep 2026 19:19:15 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-77421 · Revision 1Source updated