CVE-2026-3635
unknown
CVSS v3
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CVSS v4 NEW
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VIR risk
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Description
fastify: request.protocol and request.host Spoofable via X-Forwarded-Proto/Host from Untrusted Connections
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| npm | fastify | <5.8.3 | 5.8.3 |
References
- https://github.com/fastify/fastify/security/advisories/GHSA-444r-cwp2-x5xf
- https://nvd.nist.gov/vuln/detail/CVE-2026-3635
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fastify
- https://github.com/fastify/fastify/releases/tag/v5.8.3
- https://www.cve.org/CVERecord?id=CVE-2026-3635
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.