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.
History

Tue, 09 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard
Weaknesses CWE-367
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 4.3, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-06-09T18:26:54.848Z

Reserved: 2026-06-02T16:30:15.233Z

Link: CVE-2026-49958

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-09T17:17:49.220

Modified: 2026-06-09T17:17:49.220

Link: CVE-2026-49958

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.