GHSA-jpf4-98qj-qr67

Suggest an improvement
Source
https://github.com/advisories/GHSA-jpf4-98qj-qr67
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-jpf4-98qj-qr67/GHSA-jpf4-98qj-qr67.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-jpf4-98qj-qr67
Aliases
Published
2026-09-22T20:37:16Z
Modified
2026-09-22T21:00:09Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Summary
Nuclei: Arbitrary Command Execution via DAST Code Signature Bypass
Details

A vulnerability in Nuclei's DAST template loading path allows unsigned code: protocol templates to execute, bypassing the cryptographic signature requirement that is meant to prevent arbitrary command execution from untrusted templates.

Affected Component

The issue is in the template loader's DAST loading branch. When -dast is enabled and a template contains a fuzzing: block, the loader accepted the template through a code path that omitted the unsigned-code-template signature check present in the normal loading branch.

Description

Nuclei requires code: protocol templates to be cryptographically signed before execution. Unsigned code templates are normally skipped with a warning. However, when a template combined a fuzzing: block (making it DAST-eligible) with an unsigned code: block, enabling -dast routed the template through the DAST loader branch, which did not enforce signature verification.

For multiprotocol templates containing both HTTP and code: blocks, the unsigned code request was included in the execution queue regardless of whether -code was set. This allowed arbitrary shell command execution from an unsigned code: block with only -dast enabled.

[!NOTE] Both DAST mode (-dast) and code-protocol templates are disabled by default. Code templates normally require both the -code flag and a valid template signature. This issue bypassed the signature and -code controls only when -dast was explicitly enabled.

Affected Users

  • CLI users running DAST/fuzzing scans (-dast) with untrusted or attacker-supplied templates that contain both fuzzing: and code: blocks.
  • SDK users who integrate Nuclei with DAST mode enabled and allow end users to supply custom templates.

Patches

Mitigation

Upgrade to Nuclei v3.10.0, where code template signature verification is enforced before DAST loading.

In the meantime, avoid running DAST scans with untrusted templates.

Workarounds

If upgrading is not an option, do not use -dast with templates from unverified sources.

Acknowledgments

Thanks to @daffainfo for reporting this issue.

Database specific 
{
    "cwe_ids":  [
        "CWE-78"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-22T20:37:16Z",
    "nvd_published_at":  "2026-09-22T17:17:24Z",
    "severity":  "MODERATE"
}
References

Affected packages

Go / github.com/projectdiscovery/nuclei/v3

Package

Name
github.com/projectdiscovery/nuclei/v3
View open source insights on deps.dev
Purl
pkg:golang/github.com/projectdiscovery/nuclei/v3

Affected ranges

Type
SEMVER
Events
Introduced
3.0.0
Fixed
3.10.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-jpf4-98qj-qr67/GHSA-jpf4-98qj-qr67.json"