{"affected":[{"package":{"ecosystem":"Hex","name":"grpc","purl":"pkg:hex/grpc"},"ranges":[{"events":[{"introduced":"0.4.0"},{"fixed":"1.0.0"}],"type":"SEMVER"}],"versions":["0.5.0-beta","0.5.0-beta.1","0.5.0","0.6.0","0.7.0","0.8.0","0.8.1","0.9.0","0.10.0","0.10.1","0.10.2","0.11.0","0.11.1","0.11.2","0.11.3","0.11.4","0.11.5","1.0.0-rc.1"]},{"ranges":[{"events":[{"introduced":"beae6800fc8baf126f3fe7107d86a50e105275ba"},{"fixed":"1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc"}],"repo":"https://github.com/elixir-grpc/grpc","type":"GIT"}]}],"aliases":["GHSA-6ccx-9c9f-327w","CVE-2026-53430"],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Paulo Valente","type":"REMEDIATION_DEVELOPER"}],"database_specific":{"capec_ids":["CAPEC-130"],"cpe_ids":["cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-409"]},"details":"## Summary\n\nImproper 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.","id":"EEF-CVE-2026-53430","modified":"2026-06-15T21:55:33.707Z","published":"2026-06-15T21:55:33.707Z","references":[{"type":"ADVISORY","url":"https://github.com/elixir-grpc/grpc/security/advisories/GHSA-6ccx-9c9f-327w"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-53430.html"},{"type":"FIX","url":"https://github.com/elixir-grpc/grpc/commit/1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"grpc gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1","upstream":[]}