CVE-2026-76803 Nuclei: Local File Read via MySQL Client Sandbox Bypass
Attackers can read arbitrary local files by exploiting a MySQL client sandbox bypass in Nuclei when scanning malicious endpoints with JavaScript templates.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-76803?
CVE-2026-76803 is a medium-severity path traversal vulnerability in projectdiscovery nuclei, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-76803?
5 open source packages ship an affected version, including github.com/projectdiscovery/nuclei/v3, github.com/projectdiscovery/nuclei and github.com/projectdiscovery/nuclei/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/projectdiscovery/nuclei/v3 Go | From 3.0.0 | 3.10.0 |
github.com/projectdiscovery/nuclei/v3 Go | From 3.0.0 | 3.10.0 |
github.com/projectdiscovery/nuclei/v3 Go | From 3.0.0 | 3.10.0 |
github.com/projectdiscovery/nuclei Go | All versions | None |
github.com/projectdiscovery/nuclei/v2 Go | All versions | None |
How do I fix CVE-2026-76803?
Upgrade github.com/projectdiscovery/nuclei/v3 to 3.10.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-76803 being exploited?
There is no known exploitation of CVE-2026-76803 in the wild and no public exploit code.
Sources
Also known as GHSA-xhmx-w2j4-rw3q, GO-2026-6577.