Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-76805— Nuclei: Environment Variable Disclosure via Response-Derived Data in DAST/Fuzz Mode

Quick assessment

Affected
projectdiscovery nuclei
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From 3.0.0 until 3.10.0, the DAST/fuzz payload path in pkg/fuzz/parts.go can evaluate substituted runtime data more than once, creating a second evaluation pass that allows response content ca

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectdiscovery nuclei >= 3.0.0, < 3.10.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-76805

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Nuclei: Environment Variable Disclosure via Response-Derived Data in DAST/Fuzz Mode
Source: CVE Program / CVE List V5
Vulnerability Description
Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From 3.0.0 until 3.10.0, the DAST/fuzz payload path in pkg/fuzz/parts.go can evaluate substituted runtime data more than once, creating a second evaluation pass that allows response content captured by an internal: true extractor in one protocol step to be reinterpreted as template syntax in a later fuzz step. This vulnerability is an incomplete fix for CVE-2026-41645: the prior remediation made expressions.Evaluate() single-pass within one call but did not prevent DAST/fuzz callers from evaluating substituted output again. When -env-vars is enabled, a malicious scan target can return marker-shaped content that resolves against the template variable map and discloses scanner-host environment variables such as credentials, API keys, or tokens. The vulnerability requires a multi-step DAST or fuzz template, response data reused through an internal extractor, and explicit environment-variable expansion; users who do not enable -env-vars are not affected by the sensitive-information disclosure. This issue is fixed in version 3.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectdiscovery nuclei >= 3.0.0, < 3.10.0 -

II. Public POCs for CVE-2026-76805

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-76805

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-76805 (1)

Proof of Concept for CVE-2026-76805 (2)

Same Patch Batch · projectdiscovery · 2026-09-22 · 4 CVEs total

CVE-2026-76804 5.5 MEDIUM Nuclei: Local File Read via Workflow File-Protocol Gate Bypass
CVE-2026-76803 5.3 MEDIUM Nuclei: Local File Read via MySQL Client Sandbox Bypass
CVE-2026-76802 4.7 MEDIUM Nuclei: Arbitrary Command Execution via DAST Code Signature Bypass

IV. Related Vulnerabilities

Same product: nuclei
Same vendor: projectdiscovery
Same weakness: CWE-200

V. Comments for CVE-2026-76805

No comments yet

Leave a comment