FKIE_CVE-2026-55601

Vulnerability from fkie_nvd - Published: 2026-10-13 20:17 - Updated: 2026-10-16 20:04
Severity
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Summary
MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review.
References
security-advisories@github.comhttps://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c
security-advisories@github.comhttps://github.com/folkertvanheusden/multitail/issues/56
security-advisories@github.comhttps://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "multitail",
          "vendor": "folkertvanheusden",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 7.1.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review."
    }
  ],
  "id": "CVE-2026-55601",
  "lastModified": "2026-10-16T20:04:29.760",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.3,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55601",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-13T20:02:02.281948Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-13T20:17:29.477",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/folkertvanheusden/multitail/commit/84f304e140261034e33796bab81e9bf4f09d153c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/folkertvanheusden/multitail/issues/56"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/folkertvanheusden/multitail/security/advisories/GHSA-54vm-wwx8-856h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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