CyberRota Analysis
AI-GeneratedThe h2o HTTP server is vulnerable to a stack overflow caused by improper handling of QPACK instructions over HTTP/3, potentially leading to a segmentation fault and server crash. This high-severity vulnerability affects any deployment of h2o that processes these instructions, making it critical for organizations using h2o to prioritize patching to ensure service stability and security. Immediate action is recommended for all users of the affected versions to mitigate the risk of denial-of-service attacks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
Note: these links are listed for security research and verification purposes only.
Original NVD Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling alloca, which exceeds the default pthread stack size used by musl libc and causes the h2o server to crash with a segmentation fault while touching the guard page. This issue is fixed in commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1.