CVE-2026-49958

MEDIUM 5.0

Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard

CVSS Score

5.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-367
Vendor	nesquena
Product	hermes-webui
Published	Jun 9, 2026
Last Updated	Jun 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

nesquena / hermes-webui

0 < 0.51.303

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nesquena/hermes-webui/releases/tag/v0.51.303 github.com: https://github.com/nesquena/hermes-webui/pull/3702 github.com: https://github.com/nesquena/hermes-webui/pull/3756 github.com: https://github.com/nesquena/hermes-webui/commit/4580f584964d640b95c4ffc9245a21ab926bec73 vulncheck.com: https://www.vulncheck.com/advisories/hermes-webui-toctou-race-condition-via-git-discard

Credits

Chia Min Jun Lennon