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CVE-2026-100864— heym before 0.0.91 Remote Code Execution via Expression Engine

Quick assessment

Affected
heymrun heym
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 heym 0.0.91 之前的版本中，其表达式引擎的 DotList map/filter 功能以及 fallback 解析器存在一个沙箱逃逸漏洞，允许经过身份验证的用户执行任意 Python 代码。攻击者可以通过在 item 表达式或使用 fallback 解析器时构造包含双下划线（dunder）属性访问的 workflow 表达式，来访问 ，从而以后端进程的身份执行系统命令。

CVSS 8.8 · High EPSS 0.69% · P51
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I. Basic Information for CVE-2026-100864

Vulnerability Information
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Vulnerability Title
heym before 0.0.91 Remote Code Execution via Expression Engine
Source: CVE Program / CVE List V5
Vulnerability Description
heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows authenticated users to execute arbitrary Python code. Attackers can craft workflow expressions using dunder attribute access through item expressions or the fallback resolver to access os.system and execute commands as the backend process.
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
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
heymrun heym 0 ~ 0.0.91 -

II. Public POCs for CVE-2026-100864

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III. Intelligence Information for CVE-2026-100864

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Vendor Advisories for CVE-2026-100864 (1)

Other References for CVE-2026-100864 (1)

Same Patch Batch · heymrun · 2026-09-27 · 10 CVEs total

CVE-2026-100865 8.8 HIGH Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape
CVE-2026-100858 6.8 MEDIUM heym before 0.0.109 Server-Side Request Forgery via Workflow Nodes
CVE-2026-101050 6.5 MEDIUM Heym before 0.0.53 Authentication Bypass via Telegram Webhook
CVE-2026-101049 6.5 MEDIUM Heym before 0.0.53 Slack Webhook Signature Verification Bypass
CVE-2026-100859 6.5 MEDIUM Heym before 0.0.106 Credential Exfiltration via URL Override
CVE-2026-100860 5.5 MEDIUM heym before 0.0.105 Authentication Bypass via Redis Node
CVE-2026-100861 5.0 MEDIUM heym before 0.0.105 SSRF via credential-controlled base URLs
CVE-2026-100863 5.0 MEDIUM Heym before 0.0.91 SSRF via image fetching and IPv6 validation
CVE-2026-100862 4.9 MEDIUM heym before 0.0.91 Multiple Secrets Plaintext Storage

IV. Related Vulnerabilities

Same product: heym
Same vendor: heymrun
Same weakness: CWE-94

V. Comments for CVE-2026-100864

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