nesquena hermes-webui up to 0.51.310 api/workspace_git.py os command injection

Summaryinfo

A vulnerability was found in nesquena hermes-webui up to 0.51.310. It has been classified as critical. Affected is an unknown function of the file api/workspace_git.py. Performing a manipulation results in os command injection. This vulnerability is known as CVE-2026-49959. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in nesquena hermes-webui up to 0.51.310. This affects an unknown code block of the file api/workspace_git.py. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by placing malicious executable Git configuration in a workspace repository's .git/config file. Attackers can exploit Git subprocess invocations in api/workspace_git.py through vectors such as core.fsmonitor during git status, protocol.ext.allow with ext:: remotes during git fetch, credential.helper, core.askPass, core.gitProxy, or inherited environment variables including GIT_SSH_COMMAND to achieve arbitrary command execution on the host running the application.

The weakness was published by Chia Min Jun Lennon. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-49959 since 06/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 0.51.311 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 938ac9f55b53def1eefb48c4c42dabaf9c22e99c 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

• 0.51.310

License

• open-source

Website

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

CPE 2.3info

• 🔒

CPE 2.2info

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