{"id":"CVE-2021-36154","aliases":["GHSA-4rhq-vq24-88gw"],"url":"https://o3.security/vulnerability/CVE-2021-36154","summary":"Uncontrolled Recursion in HTTP2ToRawGRPCServerCodec","details":"### Impact\n\nAffected gRPC Swift servers are vulnerable to uncontrolled recursion and stack consumption when parsing certain payloads. This may lead to a denial of service.\n\n### Patches\n\nThe problem has been fixed in 1.2.0.\n\n### Workarounds\n\nNo workaround is available. Users must upgrade.","published":"2021-07-09T12:15:08.097Z","modified":"2026-07-09T10:01:23.984467Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.02082,"percentile":0.80625,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"SwiftURL","name":"github.com/grpc/grpc-swift","fixedVersion":"1.2.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35274"},{"type":"ADVISORY","url":"https://github.com/grpc/grpc-swift/releases"},{"type":"ADVISORY","url":"https://github.com/grpc/grpc-swift/security/advisories/GHSA-4rhq-vq24-88gw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36154"},{"type":"PACKAGE","url":"https://github.com/grpc/grpc-swift"},{"type":"WEB","url":"https://github.com/grpc/grpc-swift/releases/tag/1.2.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:01:23.984467Z"}}