nesquena hermes-webui up to PR #415 /api/ path traversal

Summaryinfo

A vulnerability classified as critical has been found in nesquena hermes-webui up to PR #415. This vulnerability affects unknown code of the file /api/. This manipulation causes path traversal. This vulnerability is registered as CVE-2026-6829. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in nesquena hermes-webui up to PR #415 and classified as critical. Affected by this vulnerability is some unknown processing of the file /api/. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

nesquena hermes-webui contains a trust-boundary failure vulnerability that allows authenticated attackers to set or change a session workspace to an arbitrary existing directory on disk by manipulating workspace path parameters in endpoints such as /api/session/new, /api/session/update, /api/chat/start, and /api/workspaces/add. Attackers can repoint a session workspace to a directory outside the intended trusted root and then use ordinary file read and write APIs to access or modify files outside the intended workspace boundary within the permissions of the hermes-webui process.

The weakness was published by Chia Min Jun Lennon. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-6829 since 04/21/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 416 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 2a7a5ddfaf39e3b0094b7ac37e9f1dbcf40a3918 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• nesquena

Name

• hermes-webui

Version

• PR #415

License

• open-source

Website

• Product: https://github.com/nesquena/hermes-webui/

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