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Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11. References: https://nvd.nist.gov/vuln/detail/CVE-2023-35945 https://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r (From OE-Core rev: 0e6eb0f417079eaf76b003973c9d93338e6363b5) Signed-off-by: Yogita Urade <yogita.urade@windriver.com> Signed-off-by: Steve Sakoman <steve@sakoman.com>