CVE-2026-6414 — @fastify/static versions 8.0.0 through 9.1.0 decode
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CVE-2026-6414 — @fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fa
What This Means For You
- If your environment is affected by CWE-177, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-6414 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
6 rules · 6 SIEM formats6 auto-generated detection rules for this incident, mapped to MITRE ATT&CK. Available in Sigma, Splunk SPL, Sentinel KQL, Elastic Lucene, QRadar AQL, and Wazuh.
Web Application Exploitation Attempt — CVE-2026-6414
Want this in your SIEM's native format? Get Splunk SPL, Sentinel KQL, Elastic, QRadar AQL, or Wazuh — ready to paste.
6 Sigma rules mapped to the ATT&CK techniques from this breach — pick your SIEM and get a ready-to-paste query.
Get All SIEM Formats →Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-6414 | vulnerability | CVE-2026-6414 |
| CWE-177 | weakness | CWE-177 |
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 16, 2026 at 16:16 UTC |
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