{"id":"CVE-2026-49958","aliases":["EUVD-2026-35706","GHSA-qg92-vxjm-x4q9"],"status":"published","title":"Hermes WebUI \u003c 0.51.303 TOCTOU Race Condition via git_discard","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.","severity":{"version":"4.0","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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00081,"percentile":0.00185,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-367"],"published":"2026-06-09T16:35:42Z","modified":"2026-11-09T02:47:15Z","products":[{"vendor":"nesquena","product":"hermes-webui"}],"references":[{"url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.303","tags":["release-notes","advisory"]},{"url":"https://github.com/nesquena/hermes-webui/pull/3702","tags":["issue-tracking","patch","exploit","fix"]},{"url":"https://github.com/nesquena/hermes-webui/pull/3756","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/nesquena/hermes-webui/commit/4580f584964d640b95c4ffc9245a21ab926bec73","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/hermes-webui-toctou-race-condition-via-git-discard","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49958","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qg92-vxjm-x4q9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49958.json","tags":["advisory"]},{"url":"https://github.com/nesquena/hermes-webui","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-49958","title":"Hermes WebUI \u003c 0.51.303 TOCTOU Race Condition via git_discard","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.","status":"published","published":"2026-06-09T16:35:42.411Z","modified":"2026-11-08T14:04:59.515Z","cvss":[{"version":"4.0","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","level":"medium","assessor":"cna"},{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-367"],"updated_at":"2026-11-08T15:43:33.322657Z"}],"euvd":[{"id":"EUVD-2026-35706","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.","status":"published","published":"2026-06-09T16:35:42Z","modified":"2026-11-08T14:04:59Z","cvss":[{"version":"4.0","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","level":"medium"}],"updated_at":"2026-11-08T15:13:08.252361Z"}],"ghsa":[{"id":"GHSA-qg92-vxjm-x4q9","title":"Hermes WebUI before version 0.51.303 contains a time-of-check time-of-use (TOCTOU) race condition...","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.","status":"published","published":"2026-06-09T18:31:01Z","modified":"2026-06-09T18:31:11Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H","level":"medium"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T15:08:42.712998Z"}],"nvd":[{"id":"CVE-2026-49958","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.","status":"published","published":"2026-06-09T17:17:49.22Z","modified":"2026-07-23T08:10:00.137Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:12:23.109705Z"}],"osv":[{"id":"CVE-2026-49958","title":"Hermes WebUI \u003c 0.51.303 TOCTOU Race Condition via git_discard","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.","status":"published","published":"2026-06-09T16:35:42.411Z","modified":"2026-11-09T02:47:15.271694722Z","cvss":[{"version":"4.0","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","level":"medium"}],"cwes":["CWE-367"],"updated_at":"2026-11-09T03:16:24.800471Z"}]}}