{"id":"CVE-2026-76805","summary":"Nuclei: Environment Variable Disclosure via Response-Derived Data in DAST/Fuzz Mode","details":"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.","aliases":["GHSA-jpvm-9frm-hjcq"],"modified":"2026-09-24T03:45:47.577944935Z","published":"2026-09-22T16:48:49.791Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-200"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76805.json"},"references":[{"type":"WEB","url":"https://github.com/projectdiscovery/nuclei/releases/tag/v3.10.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76805.json"},{"type":"ADVISORY","url":"https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-jpvm-9frm-hjcq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76805"},{"type":"FIX","url":"https://github.com/projectdiscovery/nuclei/commit/ccbfb12bd01447ba25f6e755dfb2bee677736da6"},{"type":"FIX","url":"https://github.com/projectdiscovery/nuclei/pull/7499"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/projectdiscovery/nuclei","events":[{"introduced":"990cec0de154bd3955e0c1e19951f90e06f6ea7c"},{"fixed":"ccbfb12bd01447ba25f6e755dfb2bee677736da6"},{"fixed":"f9cf234c12a333656751e04493dc4b1f4f5f3e88"}],"database_specific":{"extracted_events":[{"introduced":"3.0.0"},{"fixed":"3.10.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v3.9.0","v3.8.0","v3.7.1","v3.7.0","v3.6.2","v3.6.1","v3.6.0","v3.5.1","v3.5.0","v3.4.10","v3.4.9","v3.4.8","v3.4.7","v3.4.6","v3.4.5","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0","v3.3.10","v3.3.9","v3.3.8","v3.3.7","v3.3.6","v3.3.5","v3.3.4","v3.3.3","v3.3.2","v3.3.1","v3.3.0","v3.2.9","v3.2.8","v3.2.7","v3.2.6","v3.2.5","v3.2.4","v3.2.3","v3.2.2","v3.2.1","v3.2.0","v3.1.10","v3.1.9","v3.1.8","v3.1.7","v3.1.6","v3.1.5","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76805.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}