CVE-2026-86439: knowns before 0.30.0 Path Traversal via MCP doc and memory tools
knowns-dev · knowns
Fixed in 0.30.0 · Affected: knowns-dev before 0.30.0 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 65% of scored CVEs
DescriptionCVE.org
knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- knowns-dev · knownsbefore 0.30.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- knowns-dev
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-86439 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.