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http2: allow security revert for Ping/Settings Flood

nghttp2 has updated its limit for outstanding Ping/Settings ACKs
to 1000. This commit allows reverting to the old default of 10000.

The associated CVEs are CVE-2019-9512/CVE-2019-9515.

PR-URL: #29122
Reviewed-By: Rich Trott <>
Reviewed-By: James M Snell <>
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addaleax authored and targos committed Aug 12, 2019
1 parent bbb4769 commit 08021fac59a3aae798d42f9b870012acc1e634c5
Showing with 4 additions and 0 deletions.
  1. +3 −0 src/
  2. +1 −0 src/node_revert.h
@@ -151,6 +151,9 @@ Http2Options::Http2Options(Environment* env, nghttp2_session_type type) {

if (IsReverted(SECURITY_REVERT_CVE_2019_9512))
nghttp2_option_set_max_outbound_ack(options_, 10000);

// The padding strategy sets the mechanism by which we determine how much
// additional frame padding to apply to DATA and HEADERS frames. Currently
// this is set on a per-session basis, but eventually we may switch to
@@ -16,6 +16,7 @@
namespace node {

XX(CVE_2019_9512, "CVE-2019-9512", "HTTP/2 Ping/Settings Flood") \
XX(CVE_2019_9514, "CVE-2019-9514", "HTTP/2 Reset Flood") \
XX(CVE_2019_9516, "CVE-2019-9516", "HTTP/2 0-Length Headers Leak") \
XX(CVE_2019_9518, "CVE-2019-9518", "HTTP/2 Empty DATA Frame Flooding") \

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