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.

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History

Tue, 14 Jul 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Get-hermes
Get-hermes hermes Web Ui
CPEs cpe:2.3:a:get-hermes:hermes_web_ui:*:*:*:*:*:*:*:*
Vendors & Products Get-hermes
Get-hermes hermes Web Ui

Wed, 10 Jun 2026 01:15:00 +0000

Type Values Removed Values Added
First Time appeared Nesquena
Nesquena hermes-webui
Vendors & Products Nesquena
Nesquena hermes-webui

Tue, 09 Jun 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-07-14T21:33:30.028Z

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

Link: CVE-2026-49958

cve-icon Vulnrichment

Updated: 2026-06-09T18:26:50.630Z

cve-icon NVD

Status : Deferred

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

Modified: 2026-06-09T19:36:10.547

Link: CVE-2026-49958

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T01:00:11Z

Weaknesses