Vector: Arbitrary file write in the file sink via templated path (path traversal).
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| vectordotdev | vector | 0.10.0 to before 0.57.0 | 0.57.0 | Patch available | CNA |
- vector Vendorvectordotdev Affected 0.10.0 to before 0.57.0 Fixed in 0.57.0 Patch available CNA
Remediation
- Fix · CNA vector (vectordotdev) Fixed in 0.57.0
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 1 product
- Logging Subsystem for Red Hat OpenShift
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77621
- 2026-10-07 Affected versions changed · Red Hat
- 2026-10-07 CVSS score added · Red Hat
References
Other 6
- https://github.com/vectordotdev/vector/security/advisories/GHSA-6342-xwvw-c637
- https://github.com/vectordotdev/vector/pull/25820
- https://github.com/vectordotdev/vector/pull/25830
- https://github.com/vectordotdev/vector/commit/6951064ed1d295fbff67a5ba7da5971fc6f58c46
- https://github.com/vectordotdev/vector/commit/8832452f57afb536ea0de53a093f9fd1b669ccec
- https://github.com/vectordotdev/vector/releases/tag/v0.57.0
More vectordotdev vulnerabilities
- TI-2026-54102 Vector: Unauthenticated denial of service in the `logstash` source via nested compressed… CVSS 4.0HIGH 8.7
- TI-2026-54101 Vector: Unauthenticated denial of service in the `logstash` source via unbounded memory allocation. CVSS 4.0HIGH 8.7
Sources
- CVE-2026-77621 · CVE Program
- CVE-2026-77621 · NVD
- FIRST EPSS
- CVE-2026-77621 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences