CVE-2026-3419
unknown
CVSS v3
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CVSS v4 NEW
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VIR risk
—
Description
Fastify's Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation
Predictions
Exploit likelihood
30%
Patch ETA
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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 | >=5.7.2,<5.8.1 | 5.8.1 |
References
- https://github.com/fastify/fastify/security/advisories/GHSA-573f-x89g-hqp9
- https://nvd.nist.gov/vuln/detail/CVE-2026-3419
- https://github.com/fastify/fastify/commit/67f6c9b32cb3623d3c9470cc17ed830dd2f083d7
- https://cna.openjsf.org/security-advisories.html
- https://github.com/advisories/GHSA-573f-x89g-hqp9
- https://github.com/fastify/fastify
- https://httpwg.org/specs/rfc9110.html#field.content-type
- https://www.cve.org/CVERecord?id=CVE-2026-3419
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.