{"id":"CVE-2026-53430","aliases":["EEF-CVE-2026-53430","GHSA-6ccx-9c9f-327w"],"url":"https://o3.security/vulnerability/CVE-2026-53430","summary":"grpc gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1","details":"Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in elixir-grpc grpc (GRPC.Compressor.Gzip, GRPC.Message modules) allows a denial of service via a gzip decompression bomb.\n\nThis vulnerability is associated with program files lib/grpc/compressor/gzip.ex, lib/grpc/message.ex and program routines 'Elixir.GRPC.Compressor.Gzip':decompress/1, 'Elixir.GRPC.Message':from_data/2.\n\n'Elixir.GRPC.Compressor.Gzip':decompress/1 calls :zlib.gunzip/1 directly on attacker-controlled bytes with no decompressed-size limit, ratio check, or incremental decoding. Because this module is the registered gzip GRPC.Compressor implementation, it is invoked automatically whenever an incoming gRPC frame carries the grpc-encoding: gzip header. :zlib.gunzip/1 allocates the entire decompressed result as a single binary, so a small highly compressible payload (for example a few kilobytes of zeros, which gzip compresses at roughly 1000:1) expands to multiple gigabytes inside a single call. The max_receive_message_length limit is enforced only against the already-decompressed message, so it provides no protection. An unauthenticated remote peer can send a single crafted frame to exhaust the BEAM node's heap and trigger an out-of-memory kill.\n\nThis issue affects grpc: from 0.4.0 before 1.0.0.","published":"2026-06-15T21:55:33.707Z","modified":"2026-08-12T03:51:37.033730880Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Hex","name":"grpc","fixedVersion":"1.0.0"}],"fix":{"url":"https://github.com/elixir-grpc/grpc/commit/1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc","label":"elixir-grpc/grpc@1afbab9"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-53430.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://hex.pm"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-53430"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53430.json"},{"type":"ADVISORY","url":"https://github.com/elixir-grpc/grpc/security/advisories/GHSA-6ccx-9c9f-327w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53430"},{"type":"FIX","url":"https://github.com/elixir-grpc/grpc/commit/1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc"},{"type":"PACKAGE","url":"https://github.com/elixir-grpc/grpc"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:37.033730880Z"}}