Which versions of Hermes WebUI are affected by EUVD-2026-34331?

Hermes WebUI before version 0.51.221 contains an authenticated information disclosure vulnerability allowing users to read sensitive files outside their workspace, including SSH keys and cloud…. A patch is available.

How to fix or mitigate EUVD-2026-34331?

Within 24 hours: Identify all Hermes WebUI deployments and current versions. Within 7 days: Upgrade all instances to Hermes WebUI v0.51.221 or later; review file access logs for unusual external path references. Within 30 days: Verify all patches deployed; audit cloud and SSH credentials for evidence of unauthorized access.

Hermes WebUI EUVD-2026-34331

Q: What is the CVSS score of EUVD-2026-34331?

EUVD-2026-34331 has a CVSS 4.0 base score of 7.1 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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. EPSS exploitation probability: 0.0%.

| CVE-2026-11322 HIGH

Improper Link Resolution Before File Access (CWE-59)

2026-06-04 VulnCheck

GHSA-wp87-gw3h-3hx6

Information Disclosure Path Traversal Hermes Webui Suse

7.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.1 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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

SUSE

HIGH

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Source Code Evidence Fetched

Jun 04, 2026 - 22:35 vuln.today

Analysis Generated

Jun 04, 2026 - 22:35 vuln.today

Severity Changed

Jun 04, 2026 - 22:22 NVD

MEDIUM HIGH

CVSS changed

Jun 04, 2026 - 22:22 NVD

6.5 (MEDIUM) 7.1 (HIGH)

DescriptionCVE.org

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.

AnalysisAI

Information disclosure in Hermes WebUI before v0.51.221 allows authenticated remote attackers to read arbitrary files outside the designated workspace by placing symlinks that resolve to external host paths and accessing them through the workspace file or listing APIs. Because the vulnerable code only blocked raw '..' traversal and a small denylist of system directories rather than enforcing that resolved targets stay within the workspace root, attackers can disclose sensitive host content such as SSH keys, cloud credentials, and application tokens. No public exploit identified at time of analysis, but the patch and a VulnCheck advisory are published and the fix is straightforward to reverse-engineer from the upstream commit.

Technical ContextAI

Hermes WebUI is a Python-based web interface (cpe:2.3:a:nesquena:hermes_webui) whose workspace abstraction is meant to confine file reads and directory listings to a per-session root directory reachable by both the browser UI and agent/tool calls. The root cause is CWE-59 (Link Following): the prior safe_resolve_ws logic in api/workspace.py treated symlinks placed inside the workspace as user-intentional, normalizing '..' without following the link and only rejecting a small set of blocked system paths (/etc, /proc, /sys, /dev). The fix in commit 7c48c376299b8058fd35127a59aefadded7e4a92 unconditionally calls Path.resolve() on the request and rejects anything whose canonical path is not relative to the resolved workspace root, and list_dir now filters symlink entries whose targets escape the workspace so they are not even advertised in directory listings.

RemediationAI

Vendor-released patch: upgrade to Hermes WebUI v0.51.221 or later, which replaces the permissive symlink handling in api/workspace.py with strict Path.resolve()-based containment and filters escape-pointing symlinks out of directory listings; the fix is in commit 7c48c376299b8058fd35127a59aefadded7e4a92 (PR #3398). If immediate upgrade is not possible, run the Hermes WebUI process under a dedicated low-privilege user whose filesystem view contains no SSH keys, cloud credential files, or application tokens (this neutralizes the disclosure primitive at the cost of breaking any legitimate workflows that read host files), and additionally restrict network access to /api/list and the workspace file-read endpoints to trusted operators only - note this breaks browser UI use by general users and any LLM agent tool calls that legitimately need workspace listings. As a stopgap, audit existing workspace directories for symlinks pointing outside the workspace root and remove them, accepting that this does not prevent re-creation by an attacker with workspace write access.