# CVE-2026-86542

## Summary

- **CVE ID:** CVE-2026-86542
- **Severity:** HIGH
- **CVSS Score:** 9.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-22
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 11, 2026

## Description

knowns before 0.30.0 fails to validate import names in the import routes, allowing unauthenticated attackers to write files outside the imports directory. Attackers can supply traversal sequences in the name parameter to escape the imports directory and overwrite arbitrary files writable by the server process.

## Affected Products

- knowns-dev — knowns (0)
- knowns-dev — knowns (0.30.0)

## References

- [CNA](https://github.com/knowns-dev/knowns/security/advisories/GHSA-wh3c-v55g-qfg8)
- [CNA](https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/imports.go#L519-L551)
- [CNA](https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/imports.go#L376-L420)
- [CNA](https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396)
- [CNA](https://github.com/knowns-dev/knowns/releases/tag/v0.30.0)
- [CNA](https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-import-name)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._