CVE-2026-49958: Nesquena Hermes-Webui

Medium severity, CVSS 5.0. EPSS: 0.1% chance of exploitation in the next 30 days.

Hermes WebUI before version 0.51.303 contains a time-of-check time-of-use (TOCTOU) race condition vulnerability in the git_discard function within api/workspace_git.py that allows attackers to delete files outside the configured workspace boundary by replacing a validated path component with a symlink after validation but before deletion. Attackers can substitute a workspace-controlled path component with a symlink pointing to an external directory between the safe_resolve_ws() validation step and the subsequent Path.unlink() or shutil.rmtree() deletion call, causing the delete operation to follow the symlink and remove arbitrary files outside the workspace.

Affected products

• Nesquena Hermes-Webui: before 0.51.303 (fixed in 0.51.303)

Published 2026-06-09. Last modified 2026-07-23.