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

What is CVE-2026-41645?

CVE-2026-41645 is a medium-severity code injection vulnerability in projectdiscovery nuclei, published on 8 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-94

Which versions are affected by CVE-2026-41645?

It affects 1 product.

Products include Projectdiscovery Nuclei.

How do I fix CVE-2026-41645?

Upgrade to a fixed version.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-41645 being exploited?

There is no known exploitation of CVE-2026-41645 in the wild and no public exploit code.

Other vulnerabilities in projectdiscovery nuclei

• CVE-2023-37896 Nuclei Path Traversal vulnerability High 7.5
• CVE-2024-43405 Nuclei Template Signature Verification Bypass High 7.4
• CVE-2024-27920 Unsigned code template execution through workflows in projectdiscovery/nuclei High 7.4
• CVE-2026-41646 Nuclei: Local File Read via require() Module Loader Bypass Medium 5.5
• CVE-2026-41282 Code injection in Nuclei Medium 4.0

Sources

• CVE record
• NVD
• OSV
• How this page is made