HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "apache2-suexec-pristine-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-dev": "2.4.18-2ubuntu3.17+esm12", "apache2-bin": "2.4.18-2ubuntu3.17+esm12", "apache2-suexec-pristine": "2.4.18-2ubuntu3.17+esm12", "apache2-doc": "2.4.18-2ubuntu3.17+esm12", "apache2": "2.4.18-2ubuntu3.17+esm12", "apache2-dev-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-dbg": "2.4.18-2ubuntu3.17+esm12", "apache2-utils-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-data": "2.4.18-2ubuntu3.17+esm12", "apache2-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-suexec-custom-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-bin-dbgsym": "2.4.18-2ubuntu3.17+esm12", "apache2-utils": "2.4.18-2ubuntu3.17+esm12", "apache2-suexec-custom": "2.4.18-2ubuntu3.17+esm12" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "apache2-ssl-dev": "2.4.29-1ubuntu4.27+esm2", "apache2-dbg": "2.4.29-1ubuntu4.27+esm2", "apache2-dev": "2.4.29-1ubuntu4.27+esm2", "apache2-bin": "2.4.29-1ubuntu4.27+esm2", "apache2-data": "2.4.29-1ubuntu4.27+esm2", "apache2-suexec-pristine": "2.4.29-1ubuntu4.27+esm2", "apache2-doc": "2.4.29-1ubuntu4.27+esm2", "apache2": "2.4.29-1ubuntu4.27+esm2", "apache2-utils": "2.4.29-1ubuntu4.27+esm2", "apache2-suexec-custom": "2.4.29-1ubuntu4.27+esm2" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "apache2-suexec-pristine-dbgsym": "2.4.41-4ubuntu3.17", "apache2-suexec-custom": "2.4.41-4ubuntu3.17", "apache2-dev": "2.4.41-4ubuntu3.17", "apache2-bin": "2.4.41-4ubuntu3.17", "apache2-suexec-pristine": "2.4.41-4ubuntu3.17", "apache2-doc": "2.4.41-4ubuntu3.17", "libapache2-mod-md": "2.4.41-4ubuntu3.17", "apache2": "2.4.41-4ubuntu3.17", "apache2-utils-dbgsym": "2.4.41-4ubuntu3.17", "apache2-data": "2.4.41-4ubuntu3.17", "libapache2-mod-proxy-uwsgi": "2.4.41-4ubuntu3.17", "apache2-suexec-custom-dbgsym": "2.4.41-4ubuntu3.17", "apache2-bin-dbgsym": "2.4.41-4ubuntu3.17", "apache2-utils": "2.4.41-4ubuntu3.17", "apache2-ssl-dev": "2.4.41-4ubuntu3.17" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "apache2-suexec-pristine-dbgsym": "2.4.52-1ubuntu4.9", "apache2-suexec-custom": "2.4.52-1ubuntu4.9", "apache2-dev": "2.4.52-1ubuntu4.9", "apache2-bin": "2.4.52-1ubuntu4.9", "apache2-suexec-pristine": "2.4.52-1ubuntu4.9", "apache2-doc": "2.4.52-1ubuntu4.9", "libapache2-mod-md": "2.4.52-1ubuntu4.9", "apache2": "2.4.52-1ubuntu4.9", "apache2-utils-dbgsym": "2.4.52-1ubuntu4.9", "apache2-data": "2.4.52-1ubuntu4.9", "libapache2-mod-proxy-uwsgi": "2.4.52-1ubuntu4.9", "apache2-suexec-custom-dbgsym": "2.4.52-1ubuntu4.9", "apache2-bin-dbgsym": "2.4.52-1ubuntu4.9", "apache2-utils": "2.4.52-1ubuntu4.9", "apache2-ssl-dev": "2.4.52-1ubuntu4.9" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "apache2-suexec-pristine-dbgsym": "2.4.58-1ubuntu8.1", "apache2-suexec-custom": "2.4.58-1ubuntu8.1", "apache2-dev": "2.4.58-1ubuntu8.1", "apache2-bin": "2.4.58-1ubuntu8.1", "apache2-suexec-pristine": "2.4.58-1ubuntu8.1", "apache2-doc": "2.4.58-1ubuntu8.1", "libapache2-mod-md": "2.4.58-1ubuntu8.1", "apache2": "2.4.58-1ubuntu8.1", "apache2-utils-dbgsym": "2.4.58-1ubuntu8.1", "apache2-data": "2.4.58-1ubuntu8.1", "libapache2-mod-proxy-uwsgi": "2.4.58-1ubuntu8.1", "apache2-suexec-custom-dbgsym": "2.4.58-1ubuntu8.1", "apache2-bin-dbgsym": "2.4.58-1ubuntu8.1", "apache2-utils": "2.4.58-1ubuntu8.1", "apache2-ssl-dev": "2.4.58-1ubuntu8.1" } ] }