{"schema_version":"1.7.5","id":"PYSEC-2026-1426","published":"2026-07-07T11:45:20.840192Z","modified":"2026-07-07T17:47:41.848620701Z","aliases":["CVE-2023-32732","GHSA-9hxf-ppjv-w6rq"],"summary":"gRPC connection termination issue","details":"gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309.","affected":[{"package":{"name":"grpcio","ecosystem":"PyPI","purl":"pkg:pypi/grpcio"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.53.0"},{"fixed":"1.53.1"},{"introduced":"1.54.0"},{"fixed":"1.54.2"}]}],"versions":["1.53.0","1.54.0"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/grpcio/PYSEC-2026-1426.yaml"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32732"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/32309"},{"type":"WEB","url":"https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10"},{"type":"WEB","url":"https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946"},{"type":"WEB","url":"https://github.com/grpc/grpc/releases/tag/v1.53.1"},{"type":"WEB","url":"https://github.com/grpc/grpc/releases/tag/v1.54.2"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL"},{"type":"PACKAGE","url":"https://pypi.org/project/grpcio"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-9hxf-ppjv-w6rq"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}