nesquena hermes-webui up to 0.51.295 Working Directory _remote_terminal_workspace_candidate path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in nesquena hermes-webui up to 0.51.295. Affected is the function _remote_terminal_workspace_candidate of the component Working Directory Handler. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-49957. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in nesquena hermes-webui up to 0.51.295 and classified as critical. Affected by this issue is the function _remote_terminal_workspace_candidate of the component Working Directory Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

Hermes WebUI before version 0.51.269 contains a workspace boundary bypass vulnerability that allows authenticated attackers to circumvent blocked-root path checks by exploiting an early return in the SSH/remote terminal profile workspace resolution logic within _remote_terminal_workspace_candidate(). Attackers can configure a remote terminal working directory to a system directory such as /etc, causing the workspace resolution path to accept it as a trusted local workspace root before the _is_blocked_workspace_path() guard executes, enabling read access to local system files through workspace file-read helpers.

The weakness was released by Chia Min Jun Lennon. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-49957 since 06/02/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 0.51.296 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 91a89fb5d5c0bf87932917f9914ad0150ea62fe4 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

• 0.51.295

License

• open-source

Website

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

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