{"id":"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.","aliases":["EEF-CVE-2026-53430","GHSA-6ccx-9c9f-327w"],"modified":"2026-06-18T03:56:18.975864299Z","published":"2026-06-15T21:55:33.707Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-409"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53430.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"beae6800fc8baf126f3fe7107d86a50e105275ba"},{"fixed":"1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc"}]}]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/elixir-grpc/grpc","events":[{"introduced":"e45282526107417bd54f57bb8298b52a7c272ccb"},{"fixed":"8105f803030f7f5ae1d722251ee6ab2e36878830"},{"fixed":"1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.4.0"},{"fixed":"1.0.0"}]}}],"versions":["v0.11.2","v0.8.1","v0.8.0","v0.7.0","v0.6.0","v0.5.0","v0.5.0-beta.1","v0.5.0-beta","v0.4.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53430.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","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"}]}