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Vulnerability · Published May 8, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity code injection in nuclei from projectdiscovery. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 71.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/projectdiscovery/nucleino fix listedGO-2026-5473
Gogithub.com/projectdiscovery/nuclei/v2no fix listedGO-2026-5473
Gogithub.com/projectdiscovery/nuclei/v33.8.0GHSA-jm34-66cf-qpvr
Gogithub.com/projectdiscovery/nuclei/v33.8.0GO-2026-5473

Affected products (as reported)

VendorProductVersions
projectdiscovery nuclei >= 3.0.0, < 3.8.0

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

References