CVE-2026-41645Network attack vector

Environment variable disclosure via response-derived DSL evaluation

Published May 8, 2026 · Updated May 8, 2026

Code injection in ProjectDiscovery Nuclei 3.0.0 and later, before 3.8.0 allows remote attackers to expose environment variables via HTTP responses. The expressions.Evaluate function substitutes response-derived placeholders and then rescans the result as DSL helper syntax, causing later requests to evaluate attacker-supplied expressions. Exposure requires a multi-step template that reuses untrusted response data and explicitly enabled -env-vars or -ev; the option is off by default.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in ProjectDiscovery Nuclei 3.0.0 and later, before 3.8.0 allows remote attackers to expose environment variables via HTTP responses. The expressions.Evaluate function substitutes response-derived placeholders and then rescans the result as DSL helper syntax, causing later requests to evaluate attacker-supplied expressions. Exposure requires a multi-step template that reuses untrusted response data and explicitly enabled -env-vars or -ev; the option is off by default.

The record

CVE
CVE-2026-41645
Published
May 8, 2026
Updated
May 8, 2026
Vendor
ProjectDiscovery
Product
Nuclei
Classifications
CWE-94, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.0.0, < 3.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ProjectDiscovery · Nucleiversion=>= 3.0.0, < 3.8.0

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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