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CVE-2026-55367: h2o: h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3

🗓️ 04 Nov 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 2 Views

Incomplete CONNECT-UDP Capsule with large length in h2o causes memory exhaustion and DoS.

Related
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-55367
4 Nov 202621:45
–circl
cve
CVE
CVE-2026-55367
4 Nov 202621:39
–cve
cvelist
Cvelist
CVE-2026-55367 h2o: heap exhaustion using capsules
4 Nov 202621:39
–cvelist
euvd
EUVD
EUVD-2026-117179
4 Nov 202621:39
–euvd
nvd
NVD
CVE-2026-55367
4 Nov 202622:18
–nvd
ptsecurity
Positive Technologies
PT-2026-137201
4 Nov 202600:00
–ptsecurity

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04 Nov 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.17.5
2