CVE-2026-86542
CVE-2026-86542
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (54.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.003
Weakness classification (CWE)
References
- gitCloneImport writes cloned files beneath the unvalidated name (v0.29.1) (technical-description)
- Import add builds the destination from the caller-supplied name (v0.29.1) (technical-description)
- knowns fix commit d3989829fb50 (patch)
- knowns v0.30.0 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-wh3c-v55g-qfg8) (vendor-advisory)
- VulnCheck Advisory: knowns before 0.30.0 Path Traversal via Import Name (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86542?
- CVE-2026-86542 is a critical-severity vulnerability, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-09-07.
- How severe is CVE-2026-86542?
- Critical severity. CVSS v3 base score is 9.1 out of 10.