Published: 13 August 2019
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
nginx added http2 support in 1.9.5
CVSS 3 base score: 6.5
Launchpad, Ubuntu, Debian
Does not exist
(http2 support not implemented)