{"id":"UBUNTU-CVE-2023-32731","details":"When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading beyond the commit contained in https://github.com/grpc/grpc/pull/33005 https://github.com/grpc/grpc/pull/33005","modified":"2026-05-20T16:07:38.273498385Z","published":"2023-06-09T11:15:00Z","upstream":["CVE-2023-32731"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-32731"},{"type":"REPORT","url":"https://github.com/grpc/grpc/pull/32309"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-32731"}],"affected":[{"package":{"name":"grpc","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.2-1","0.11.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc0","binary_version":"0.11.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-1","1.3.2-1ubuntu1","1.3.2-1.1~build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc++1","binary_version":"1.3.2-1.1~build1"},{"binary_version":"1.3.2-1.1~build1","binary_name":"libgrpc3"},{"binary_version":"1.3.2-1.1~build1","binary_name":"protobuf-compiler-grpc"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.16.1-1","1.16.1-1ubuntu1","1.16.1-1ubuntu3","1.16.1-1ubuntu4","1.16.1-1ubuntu5"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc++1","binary_version":"1.16.1-1ubuntu5"},{"binary_version":"1.16.1-1ubuntu5","binary_name":"libgrpc6"},{"binary_name":"protobuf-compiler-grpc","binary_version":"1.16.1-1ubuntu5"},{"binary_name":"python3-grpcio","binary_version":"1.16.1-1ubuntu5"},{"binary_name":"ruby-grpc","binary_version":"1.16.1-1ubuntu5"},{"binary_name":"ruby-grpc-tools","binary_version":"1.16.1-1ubuntu5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.30.2-3","1.30.2-3build1","1.30.2-3build3","1.30.2-3build5","1.30.2-3build6"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc++1","binary_version":"1.30.2-3build6"},{"binary_version":"1.30.2-3build6","binary_name":"libgrpc10"},{"binary_version":"1.30.2-3build6","binary_name":"protobuf-compiler-grpc"},{"binary_version":"1.30.2-3build6","binary_name":"python3-grpcio"},{"binary_name":"ruby-grpc","binary_version":"1.30.2-3build6"},{"binary_name":"ruby-grpc-tools","binary_version":"1.30.2-3build6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.51.1-3build3","1.51.1-3build4","1.51.1-4","1.51.1-4build1","1.51.1-4build2","1.51.1-4.1build3","1.51.1-4.1build4","1.51.1-4.1build5"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc++1.51t64","binary_version":"1.51.1-4.1build5"},{"binary_version":"1.51.1-4.1build5","binary_name":"libgrpc29t64"},{"binary_name":"protobuf-compiler-grpc","binary_version":"1.51.1-4.1build5"},{"binary_name":"python3-grpcio","binary_version":"1.51.1-4.1build5"},{"binary_name":"ruby-grpc","binary_version":"1.51.1-4.1build5"},{"binary_version":"1.51.1-4.1build5","binary_name":"ruby-grpc-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.51.1-6","1.51.1-6build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libgrpc++1.51t64","binary_version":"1.51.1-6build1"},{"binary_name":"libgrpc29t64","binary_version":"1.51.1-6build1"},{"binary_name":"protobuf-compiler-grpc","binary_version":"1.51.1-6build1"},{"binary_name":"python3-grpcio","binary_version":"1.51.1-6build1"},{"binary_name":"ruby-grpc","binary_version":"1.51.1-6build1"},{"binary_name":"ruby-grpc-tools","binary_version":"1.51.1-6build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-32731.json"}},{"package":{"name":"grpc","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/grpc?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]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