CVE-2026-55367
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 4212ce114506a073505fd389db16ad2ba4e582a0, a client could send an incomplete CONNECT-UDP Capsule with an excessively large declared length, causing H2O to keep buffering received bytes without a per-Capsule limit while waiting for the remainder. Deployments that enabled proxy.connect-udp and accepted CONNECT-UDP requests could exhaust server memory and lose availability. This vulnerability is fixed with commit 4212ce114506a073505fd389db16ad2ba4e582a0.
AI analysis
Not analysed yet.
Claude analyses new vulnerabilities after each morning's collection, most important first, up to a daily limit. The verified data on this page is complete without it.
The sources do not list affected products or versions for this vulnerability yet.
0.3%27th percentile
Bar shows rank among all scored CVEs.
Published
First publication at the source
Collected
First seen by Baba Yaga Security
Last modified
Latest change at the source