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.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-367"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49958.json"
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "0.51.303"
}
],
"source": [
"AFFECTED_FIELD",
"DESCRIPTION",
"REFERENCES"
]
}