DEBIAN-CVE-2026-54340
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-54340
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54340.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-54340
- Upstream
- Published
- 2026-07-17T00:16:25Z
- Modified
- 2026-09-14T17:03:19Z
- 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 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.
- 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