Nuclei: Environment variable disclosure via Response-Derived DSL Expressions

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Summary

CVECVE-2026-41645
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 04:16:18 UTC
Updated2026-05-08 04:16:18 UTC
DescriptionNuclei 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Projectdiscovery Nuclei affected >= 3.0.0, < 3.8.0 Not specified

References

ReferenceSourceLinkTags
github.com/projectdiscovery/nuclei/pull/7321 [email protected] github.com
github.com/projectdiscovery/nuclei/commit/6c803c74d193f85f8a6d9803ce493f... [email protected] github.com
github.com/projectdiscovery/nuclei/commit/d2217320162d5782ca7cb95bef9dda... [email protected] github.com
github.com/projectdiscovery/nuclei/security/advisories/GHSA-jm34-66cf-qpvr [email protected] github.com
github.com/projectdiscovery/nuclei/pull/7221 [email protected] github.com
github.com/projectdiscovery/nuclei/releases/tag/v3.8.0 [email protected] github.com
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