{"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":0.35104,"aliases":["GHSA-jpvm-9frm-hjcq","GO-2026-6571"],"ecosystem":"go","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T18:19:01.898488Z"},"ingestedAt":"2026-09-22T17:07:07.381Z","slug":"CVE-2026-76805","body":"## Overview\n\nNuclei 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-76805)\n\nAffected packages:\n\n- `github.com/projectdiscovery/nuclei/v3 >= 3.0.0, < 3.10.0`\n\nPatched in:\n\n- `github.com/projectdiscovery/nuclei/v3 3.10.0`\n\nSource: https://github.com/advisories/GHSA-jpvm-9frm-hjcq\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76805.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}