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CVE-2026-77621— Vector: Arbitrary file write in the file sink via templated path (path traversal).

Quick assessment

Affected
vectordotdev vector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 9.3 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
vectordotdev vector >= 0.10.0, < 0.57.0 affected
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I. Basic Information for CVE-2026-77621

Vulnerability Information

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Vulnerability Title
Vector: Arbitrary file write in the file sink via templated path (path traversal).
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vectordotdev vector >= 0.10.0, < 0.57.0 -

II. Public POCs for CVE-2026-77621

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III. Intelligence Information for CVE-2026-77621

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Patches & Fixes for CVE-2026-77621 (2)

Other References for CVE-2026-77621 (2)

Same Patch Batch · vectordotdev · 2026-09-22 · 3 CVEs total

CVE-2026-77620 8.7 HIGH Vector: Unauthenticated denial of service in the `logstash` source via nested compressed f
CVE-2026-77619 8.7 HIGH Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory al

IV. Related Vulnerabilities

Same product: vector
Same vendor: vectordotdev
Same weakness: CWE-22

V. Comments for CVE-2026-77621

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