{"id":"CVE-2026-49958","title":"Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard","summary":"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 workspac…","severity":"medium","cvss":5,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-367"],"vendor":"nesquena","product":"hermes-webui","affected":["hermes-webui < 0.51.303"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-09T18:26:30.104471Z"},"exploitAvailable":true,"published":"2026-06-09","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:04:59.515Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49958","references":[{"url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.303","label":"hermes-webui 0.51.303 Release Notes"},{"url":"https://github.com/nesquena/hermes-webui/pull/3702"},{"url":"https://github.com/nesquena/hermes-webui/pull/3756"},{"url":"https://github.com/nesquena/hermes-webui/commit/4580f584964d640b95c4ffc9245a21ab926bec73"},{"url":"https://www.vulncheck.com/advisories/hermes-webui-toctou-race-condition-via-git-discard"}],"tags":["cve.org","exploit-available"],"epss":0.00081,"epssPercentile":0.00184,"ingestedAt":"2026-11-08T14:51:22.381Z","slug":"CVE-2026-49958","body":"## Overview\n\nHermes 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.\n\n## Affected\n\n- `hermes-webui < 0.51.303`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}