DEBIAN-CVE-2026-55367
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-55367
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55367.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-55367
- Upstream
- Published
- 2026-11-04T22:18:06Z
- Modified
- 2026-11-05T10:01:07Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Debian:12 / h2o
Package
- Name
- h2o
- Purl
- pkg:deb/debian/h2o?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected