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CVE-2026-49959— Hermes WebUI < 0.51.311 RCE via Git Configuration Injection

Quick assessment

Affected
nesquena hermes-webui
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.311之前版本存在操作系统命令注入漏洞，该漏洞源于远程代码执行问题，可能导致认证攻击者通过在工作空间仓库的.git/config文件中放置恶意可执行Git配置执行任意命令。

CVSS 8.8 · High EPSS 1.27% · P69

Affected Version Matrix 1

VendorProduct Version RangeStatus
nesquena hermes-webui < 0.51.311 affected
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I. Basic Information for CVE-2026-49959

Vulnerability Information
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Vulnerability Title
Hermes WebUI < 0.51.311 RCE via Git Configuration Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by placing malicious executable Git configuration in a workspace repository's .git/config file. Attackers can exploit Git subprocess invocations in api/workspace_git.py through vectors such as core.fsmonitor during git status, protocol.ext.allow with ext:: remotes during git fetch, credential.helper, core.askPass, core.gitProxy, or inherited environment variables including GIT_SSH_COMMAND to achieve arbitrary command execution on the host running the application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Hermes Web UI 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hermes Web UI是Nathan Esquenazi个人开发者的一个轻量级、暗色主题的自主智能体Web界面。 Hermes Web UI 0.51.311之前版本存在操作系统命令注入漏洞，该漏洞源于远程代码执行问题，可能导致认证攻击者通过在工作空间仓库的.git/config文件中放置恶意可执行Git配置执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nesquena hermes-webui 0 ~ 0.51.311 -

II. Public POCs for CVE-2026-49959

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7164 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-49959

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Patches & Fixes for CVE-2026-49959 (1)

Vendor Advisories for CVE-2026-49959 (1)

Vendor Pages for CVE-2026-49959 (1)

Same Patch Batch · nesquena · 2026-06-09 · 5 CVEs total

CVE-2026-49957 7.7 HIGH Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py
CVE-2026-49956 6.5 MEDIUM Hermes WebUI < 0.51.269 Profile Isolation Bypass via sessions search
CVE-2026-49955 5.3 MEDIUM Hermes WebUI < 0.51.270 Resource Exhaustion via passkey/options
CVE-2026-49958 5.0 MEDIUM Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard

IV. Related Vulnerabilities

Same product: hermes-webui
Same vendor: nesquena
Same weakness: CWE-78

V. Comments for CVE-2026-49959

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