Is CVE-2026-86542 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-86542 being exploited in the wild.

How severe is CVE-2026-86542?

Critical severity, with a CVSS score of 9.1, published 7 September 2026.

Is there a fix for CVE-2026-86542?

A patch was published on 2026-09-07: Fixed in version 0.30.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-86542 attacked?

It is attacked over the network.

Am I affected by CVE-2026-86542?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-86542: knowns path traversal in import routes

CVE-2026-86542 · Severity: critical · CVSS 9.1 · Published 2026-09-07

knowns is a data management application that processes file imports. The import functionality fails to properly validate user-supplied file names, allowing unauthenticated attackers to write files outside the intended imports directory. An attacker can use path traversal sequences (like "../") to overwrite arbitrary files on the server, potentially compromising data integrity and system availability.

Quick answers

Is CVE-2026-86542 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-86542 being exploited in the wild.
How severe is CVE-2026-86542?: Critical severity, with a CVSS score of 9.1, published 7 September 2026.
Which products and versions are affected?: knowns knowns before 0.30.0.
Is there a fix for CVE-2026-86542?: A patch was published on 2026-09-07: Fixed in version 0.30.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-86542 attacked?: It is attacked over the network.
Am I affected by CVE-2026-86542?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a path traversal flaw in the import routes handler (internal/server/routes/imports.go) that fails to validate the import name parameter. Attackers can craft malicious requests with traversal sequences such as "../" in the name parameter to escape the imports directory boundary. The server processes these requests without authentication and writes files to arbitrary locations writable by the server process. An attacker can achieve arbitrary file write, enabling system compromise, configuration manipulation, or denial of service. The vulnerability is fixed in version 0.30.0 and later.

Affected products

knowns knowns before 0.30.0

Timeline

2026-09-07: disclosed: CVE-2026-86542 published
2026-09-07: patched: Fixed in version 0.30.0

References

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