Bug 2538052 (CVE-2026-76803)

Summary: CVE-2026-76803 nuclei: Nuclei: Information Disclosure via Local File Read Bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Nuclei, a vulnerability scanner. The nuclei/mysql JavaScript library fails to enforce its local file access restrictions when processing a specific MySQL connection option. This allows a remote attacker, by controlling a malicious MySQL endpoint, to trick the scanner into reading arbitrary local files from the system where Nuclei is running. This could lead to the disclosure of sensitive information.
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Description OSIDB Bzimport 2026-09-22 16:57:06 UTC 
Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From 3.0.0 until 3.10.0, the nuclei/mysql JavaScript library does not enforce the local-file sandbox when a JavaScript template supplies the allowAllFiles MySQL DSN option. An untrusted javascript: template scanning an attacker-controlled MySQL-compatible endpoint can cause the server to issue LOAD DATA LOCAL INFILE requests for arbitrary paths, after which the scanner's MySQL client reads the files and returns their contents to the server even though -allow-local-file-access is disabled. JavaScript templates can run unsigned and without the -code flag on affected versions, and the bypass affects CLI and SDK deployments that accept untrusted templates. This issue is fixed in version 3.10.0.