{"id":"CVE-2023-32732","aliases":["GHSA-9hxf-ppjv-w6rq","PYSEC-2026-1426"],"url":"https://o3.security/vulnerability/CVE-2023-32732","summary":"Denial-of-Service in gRPC","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 https://www.google.com/url","published":"2023-06-09T10:48:15.075Z","modified":"2026-10-28T10:38:47.533071588Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.grpc:grpc-protobuf","fixedVersion":"1.53.1"},{"ecosystem":"Maven","name":"io.grpc:grpc-protobuf","fixedVersion":"1.54.2"},{"ecosystem":"PyPI","name":"grpcio","fixedVersion":"1.53.1"},{"ecosystem":"PyPI","name":"grpcio","fixedVersion":"1.54.2"},{"ecosystem":"RubyGems","name":"grpc","fixedVersion":"1.53.1"},{"ecosystem":"RubyGems","name":"grpc","fixedVersion":"1.54.2"}],"fix":{"url":"https://github.com/grpc/grpc/pull/32309","label":"grpc/grpc#32309"},"references":[{"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/32xxx/CVE-2023-32732.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32732"},{"type":"FIX","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T10:38:47.533071588Z"}}