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Vulnerability record · CVE-2026-86542 · published 7 September 2026

CVE-2026-86542: Path traversal vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.74% · top 47.3% CWE-22 · Path traversal Deferred
8.8CVSS 4.0 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
8 Sep 2026Last modified by NVD

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.

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

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Source: NIST National Vulnerability Database (record CVE-2026-86542), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.