---
id: CVE-2026-76805
title: Nuclei is a vulnerability scanner built on a simple YAML-based DSL
summary: >-
  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 all…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
vendor: projectdiscovery
product: nuclei
affected:
  - 'nuclei >= 3.0.0, < 3.10.0'
patched:
  - github.com/projectdiscovery/nuclei/v3 3.10.0
published: '2026-09-22'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:28:25.093'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76805'
references:
  - url: >-
      https://github.com/projectdiscovery/nuclei/commit/ccbfb12bd01447ba25f6e755dfb2bee677736da6
    label: security-advisories@github.com
  - url: 'https://github.com/projectdiscovery/nuclei/pull/7499'
    label: security-advisories@github.com
  - url: 'https://github.com/projectdiscovery/nuclei/releases/tag/v3.10.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-jpvm-9frm-hjcq
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76805'
  - url: 'https://github.com/advisories/GHSA-jpvm-9frm-hjcq'
  - url: 'https://github.com/projectdiscovery/nuclei'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76805.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-76805'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-76805'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
  - osv
  - csaf
  - vex
  - red-hat
epss: 0.0041
epssPercentile: 0.35038
aliases:
  - GHSA-jpvm-9frm-hjcq
ecosystem: go
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T18:19:01.898488Z'
ingestedAt: '2026-09-22T17:07:07.381Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-76805)

Affected packages:

- `github.com/projectdiscovery/nuclei/v3 >= 3.0.0, < 3.10.0`

Patched in:

- `github.com/projectdiscovery/nuclei/v3 3.10.0`

Source: https://github.com/advisories/GHSA-jpvm-9frm-hjcq

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76805.json)