OS Command Injection in github.com/projectdiscovery/nuclei/v3 (CVE-2026-76802)
Summary
OS command injection in github.com/projectdiscovery/nuclei/v3 (CVE-2026-76802). Data can be tampered with by attackers. Mitigation: upgrade to 3.10.0 or later.
Original description
The description as published by the source.
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-codeflag and a valid template signature. This issue bypassed the signature and-codecontrols only when-dastwas explicitly enabled.
**Affected Users…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-76802 has been found in github.com/projectdiscovery/nuclei/v3.
Data can be tampered with by attackers. CVSS score: 4.7/10.
What to do: upgrade github.com/projectdiscovery/nuclei/v3 to 3.10.0 or later.
If unsure, ask your IT team or search "github.com/projectdiscovery/nuclei/v3 CVE-2026-76802" on the vendor's site.
CVE-2026-76802 (github.com/projectdiscovery/nuclei/v3) — CWE-78 / CVSS v3 4.7
Attack vector: local / unauthenticated
Patched: 3.10.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
OS command injection (CWE-78) exists in github.com/projectdiscovery/nuclei/v3.
Check the vendor advisory for the affected versions of github.com/projectdiscovery/nuclei/v3.
Severity: Medium (CVSS 4.7/10). Data can be tampered with by attackers.
Update to 3.10.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/projectdiscovery/nuclei/v3' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/projectdiscovery/nuclei/v3' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/projectdiscovery/nuclei/v3を grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/projectdiscovery/nuclei/v3 to 3.10.0ステージング環境で 3.10.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com