FKIE_CVE-2026-77621

Vulnerability from fkie_nvd - Published: 2026-09-22 16:17 - Updated: 2026-09-26 00:16
Severity
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H
Summary
Vector is a high-performance observability data pipeline. From 0.10.0 until 0.57.0, the file sink renders its templated path from event fields and opens the result without confining it to an intended directory. When an untrusted source supplies an event field used by the path template, the value can contain an absolute path or parent-directory traversal, causing Vector to create parent directories and create or overwrite files outside the intended location with the Vector process privileges. The resulting file write can modify sensitive files and can lead to code execution when a scheduled task, authorization file, or subsequently executed script is targeted. This issue is fixed in version 0.57.0.
References
security-advisories@github.comhttps://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46
security-advisories@github.comhttps://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec
security-advisories@github.comhttps://github.com/vectordotdev/vector/pull/25820
security-advisories@github.comhttps://github.com/vectordotdev/vector/pull/25830
security-advisories@github.comhttps://github.com/vectordotdev/vector/releases/tag/v0.57.0
security-advisories@github.comhttps://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "vector",
          "vendor": "vectordotdev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.10.0, \u003c 0.57.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vector is a high-performance observability data pipeline. From 0.10.0 until 0.57.0, the file sink renders its templated path from event fields and opens the result without confining it to an intended directory. When an untrusted source supplies an event field used by the path template, the value can contain an absolute path or parent-directory traversal, causing Vector to create parent directories and create or overwrite files outside the intended location with the Vector process privileges. The resulting file write can modify sensitive files and can lead to code execution when a scheduled task, authorization file, or subsequently executed script is targeted. This issue is fixed in version 0.57.0."
    }
  ],
  "id": "CVE-2026-77621",
  "lastModified": "2026-09-26T00:16:35.683",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77621",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-25T23:32:19.407102Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-22T16:17:55.670",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/pull/25820"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/pull/25830"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/releases/tag/v0.57.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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