---
id: CVE-2026-77621
title: Vector is a high-performance observability data pipeline
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 s…
severity: critical
cvss: 9.3
cvssVector: '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'
cwe:
  - CWE-22
  - CWE-73
vendor: vectordotdev
product: vector
affected:
  - 'vector >= 0.10.0, < 0.57.0'
published: '2026-09-22'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:16:35.683'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77621'
references:
  - url: >-
      https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46
    label: security-advisories@github.com
  - url: >-
      https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec
    label: security-advisories@github.com
  - url: 'https://github.com/vectordotdev/vector/pull/25820'
    label: security-advisories@github.com
  - url: 'https://github.com/vectordotdev/vector/pull/25830'
    label: security-advisories@github.com
  - url: 'https://github.com/vectordotdev/vector/releases/tag/v0.57.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-25T23:32:19.407102Z'
cvssSource: cna
epss: 0.01124
epssPercentile: 0.64856
ingestedAt: '2026-09-22T16:06:00.497Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.