CVE-2026-77621

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: CRITICAL
CVSS score: 9.3 / 10
CVSS vector: 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
Effective score: 9.3 / 10 CRITICAL source: CNA overview
CWE(s): CWE-22, CWE-73
Reserved: 2026-08-20
Published: 2026-09-22 15:19 UTC
Last updated: 2026-09-22 15:19 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/77xxx/CVE-2026-77621.json
Linked Threat: CVE-2026-77621 — Vector: Arbitrary file write in the file sink via templated path (path traversal).

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 16:17:55 UTC
NVD last modified: 2026-09-22 16:17:55 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84510
Assigner: GitHub_M
Published: Sep 22, 2026, 3:19:19 PM
Updated: Sep 22, 2026, 3:19:19 PM
EUVD base score (CVSS 4.0): 9.3 / 10
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
EUVD-reported EPSS: 0.0000
Vendors: vectordotdev
Products: Vector (0.10.0, < 0.57.0)

ENISA description: 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.

EUVD references (6)

Affected products (1)

Vendor	Product	Versions	Platforms
vectordotdev	vector	`>= 0.10.0, < 0.57.0` (affected)	—

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637 x_refsource_CONFIRM
https://github.com/vectordotdev/vector/pull/25820 x_refsource_MISC
https://github.com/vectordotdev/vector/pull/25830 x_refsource_MISC
https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46 x_refsource_MISC
https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec x_refsource_MISC
https://github.com/vectordotdev/vector/releases/tag/v0.57.0 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46 security-advisories@github.com
https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec security-advisories@github.com
https://github.com/vectordotdev/vector/pull/25820 security-advisories@github.com
https://github.com/vectordotdev/vector/pull/25830 security-advisories@github.com
https://github.com/vectordotdev/vector/releases/tag/v0.57.0 security-advisories@github.com
https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637 security-advisories@github.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:15 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:15 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:15 UTC
March 10, 2026—Hotpatch KB5079420 (OS Builds 26200.7979 and 26100.7979 ...

web:support.microsoft.com

This Hotpatch update for Windows 11, version 25H2 and 24H2 (KB5079420), improves functionality, performance, and reliability. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of ...

2026-09-23 15:15 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:15 UTC
Windows Zero-Day Patch Tuesday: 421 CVEs Fixed [2026]

web:tech-insider.org

August 2026 Patch Tuesday fixed 421 CVEs , 62 critical, and 4 zero-days. CISA issued an emergency alert for actively exploited Windows, VMware, Cisco bugs.

2026-09-23 15:15 UTC
CVE-2026-58626: Install July Updates to Fix Windows RDS RCE

web:windowsforum.com

Microsoft's July 14 security updates fix CVE - 2026 -58626, a high-severity remote code execution vulnerability in Windows Remote Desktop Services.

2026-09-23 15:15 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:15 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-09-23 15:15 UTC
CVE-2026-77621: vectordotdev vector: Vector is a high ... - Rapid7

web:www.rapid7.com

CVE-2026-77621 : vectordotdev vector: Vector is a high-performance observability data pipeline. View severity, references, and remediation details from Rapid7.

2026-09-23 15:15 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-77621.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "vector",
          "vendor": "vectordotdev",
          "versions": [
            {
              "status": "affected",
              "version": ">= 0.10.0, < 0.57.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-73",
              "description": "CWE-73: External Control of File Name or Path",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T15:19:19.526Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637"
        },
        {
          "name": "https://github.com/vectordotdev/vector/pull/25820",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/vectordotdev/vector/pull/25820"
        },
        {
          "name": "https://github.com/vectordotdev/vector/pull/25830",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/vectordotdev/vector/pull/25830"
        },
        {
          "name": "https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46"
        },
        {
          "name": "https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec"
        },
        {
          "name": "https://github.com/vectordotdev/vector/releases/tag/v0.57.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/vectordotdev/vector/releases/tag/v0.57.0"
        }
      ],
      "source": {
        "advisory": "GHSA-6342-xwvw-c637",
        "discovery": "UNKNOWN"
      },
      "title": "Vector: Arbitrary file write in the file sink via templated path (path traversal)."
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-77621",
    "datePublished": "2026-09-22T15:19:19.526Z",
    "dateReserved": "2026-08-20T20:52:01.926Z",
    "dateUpdated": "2026-09-22T15:19:19.526Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}