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Vulnerability record · CVE-2026-77621 · published 22 September 2026

CVE-2026-77621: Path traversal vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.1% · top 35.1% CWE-22 · Path traversalCWE-73 · CWE-73 Awaiting Analysis
9.3CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
26 Sep 2026Last modified by NVD

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.

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:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-77621), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.