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CVE-2026-41645— Nuclei: Environment variable disclosure via Response-Derived DSL Expressions

Quick assessment

Affected
projectdiscovery nuclei
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.

Nuclei是ProjectDiscovery开源的一个基于简单 YAML 的 DSL 的快速可定制漏洞扫描器。 Nuclei 3.0.0版本至3.8.0之前版本存在代码注入漏洞，该漏洞源于表达式评估引擎可能被恶意目标服务器注入DSL表达式，当启用-env-vars选项时可能暴露环境变量。

CVSS 5.3 · Medium EPSS 0.44% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectdiscovery nuclei >= 3.0.0, < 3.8.0 affected
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I. Basic Information for CVE-2026-41645

Vulnerability Information
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Vulnerability Title
Nuclei: Environment variable disclosure via Response-Derived DSL Expressions
Source: CVE Program / CVE List V5
Vulnerability Description
Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From version 3.0.0 to before version 3.8.0, a vulnerability in Nuclei's expression evaluation engine makes it possible for a malicious target server to inject and execute supported DSL expressions. This happens when HTTP response data containing helper/function syntax gets reused by multi-step templates. If the -env-vars / -ev option is explicitly enabled, this can expose host environment variables. That option is off by default, so standard configurations are not affected by the information disclosure risk. This issue has been patched in version 3.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
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
Vulnerability Title
Nuclei 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nuclei是ProjectDiscovery开源的一个基于简单 YAML 的 DSL 的快速可定制漏洞扫描器。 Nuclei 3.0.0版本至3.8.0之前版本存在代码注入漏洞，该漏洞源于表达式评估引擎可能被恶意目标服务器注入DSL表达式，当启用-env-vars选项时可能暴露环境变量。
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
projectdiscovery nuclei >= 3.0.0, < 3.8.0 -

II. Public POCs for CVE-2026-41645

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III. Intelligence Information for CVE-2026-41645

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Patches & Fixes for CVE-2026-41645 (3)

Vendor Advisories for CVE-2026-41645 (1)

Proof of Concept for CVE-2026-41645 (1)

IV. Related Vulnerabilities

Same product: nuclei
Same vendor: projectdiscovery
Same weakness: CWE-94

V. Comments for CVE-2026-41645

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