CVE-2026-41645: GO-2026-5473 - Nuclei: Environment variable disclosure via Response-Derived DSL Expressions in github.com/projectdiscovery/nuclei

CVE-2026-41645 · Severity: medium · CVSS 4 · Published 2026-04-20

ProjectDiscovery Nuclei 3 before 3.8.0 allows DSL expression injection. This affects use of -env-vars for multi-step templates against untrusted targets (not the default configuration).

Technologies: github.com/projectdiscovery/nuclei (Go), github.com/projectdiscovery/nuclei/v2 (Go), github.com/projectdiscovery/nuclei/v3 (Go), ProjectDiscovery Nuclei. Vendors: Go, ProjectDiscovery.

Quick answers

Is CVE-2026-41645 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-41645 being exploited in the wild.
How severe is CVE-2026-41645?
Medium severity, with a CVSS score of 4, published 20 April 2026.
Which products and versions are affected?
github.com/projectdiscovery/nuclei (Go) SEMVER:introduced=0; github.com/projectdiscovery/nuclei/v2 (Go) SEMVER:introduced=0; github.com/projectdiscovery/nuclei/v3 (Go) SEMVER:introduced=3.0.0,fixed=3.8.0.
Is there a fix for CVE-2026-41645?
Yes. github.com/projectdiscovery/nuclei/v3 (Go): upgrade to 3.8.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-41645?
Check whether you run github.com/projectdiscovery/nuclei (Go), github.com/projectdiscovery/nuclei/v2 (Go), github.com/projectdiscovery/nuclei/v3 (Go) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/projectdiscovery/nuclei/v3 (Go): upgrade to 3.8.0 or later
    go get github.com/projectdiscovery/nuclei/v3@v3.8.0

Affected products

  • github.com/projectdiscovery/nuclei (Go) SEMVER:introduced=0
  • github.com/projectdiscovery/nuclei/v2 (Go) SEMVER:introduced=0
  • github.com/projectdiscovery/nuclei/v3 (Go) SEMVER:introduced=3.0.0,fixed=3.8.0
  • ProjectDiscovery Nuclei

Identifiers

  • CVE-2026-41645
  • CVE-2026-41282
  • GHSA-jm34-66cf-qpvr
  • GO-2026-5473

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