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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Projectdiscovery | Nuclei | >= 3.0.0, < 3.8.0 |
Related Weaknesses (CWE)
References
- https://github.com/projectdiscovery/nuclei/commit/6c803c74d193f85f8a6d9803ce493fPatch
- https://github.com/projectdiscovery/nuclei/commit/d2217320162d5782ca7cb95bef9ddaPatch
- https://github.com/projectdiscovery/nuclei/pull/7221Issue TrackingPatch
- https://github.com/projectdiscovery/nuclei/pull/7321Issue TrackingPatch
- https://github.com/projectdiscovery/nuclei/releases/tag/v3.8.0ProductRelease Notes
- https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-jm34-66cf-qpMitigationPatchVendor Advisory
FAQ
What is CVE-2026-41645?
CVE-2026-41645 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 malicio...
How severe is CVE-2026-41645?
CVE-2026-41645 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-41645?
Check the references section above for vendor advisories and patch information. Affected products include: Projectdiscovery Nuclei.