FKIE_CVE-2026-77422

Vulnerability from fkie_nvd - Published: 2026-09-23 19:19 - Updated: 2026-09-24 14:18
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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 grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java's backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1.
References
security-advisories@github.comhttps://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541
security-advisories@github.comhttps://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae
security-advisories@github.comhttps://github.com/jline/jline3/pull/2012
security-advisories@github.comhttps://github.com/jline/jline3/pull/2018
security-advisories@github.comhttps://github.com/jline/jline3/releases/tag/4.3.1
security-advisories@github.comhttps://github.com/jline/jline3/releases/tag/jline-3.30.15
security-advisories@github.comhttps://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "jline3",
          "vendor": "jline",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.30.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.3.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java\u0027s backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1."
    }
  ],
  "id": "CVE-2026-77422",
  "lastModified": "2026-09-24T14:18:17.003",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77422",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-24T14:13:32.954382Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-23T19:19:15.863",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/pull/2012"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/pull/2018"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/releases/tag/4.3.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/releases/tag/jline-3.30.15"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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