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CVE-2026-33131: Authentication Bypass by Spoofing

🗓️ 20 Mar 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 5 Views

H3 is a minimal H(TTP) framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl (which extends FastURL) which allows middleware bypass. When event.url, event.url.hostname, or event.url._url...

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Refs
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20 Mar 202610:16
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CVE-2026-33131 h3 has a middleware bypass with one gadget
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h3 has a middleware bypass with one gadget
18 Mar 202616:18
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GHSA-3VJ8-JMXQ-CGJ5 h3 has a middleware bypass with one gadget
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PT-2026-26194
18 Mar 202600:00
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20 Mar 202617:32
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20 Mar 2026 00:00Current
CVSS 3.17.4 - 9.1
EPSS0.00388
SSVC
5