CVE 8.7 HIGH

grpc gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1_CVE-2026-53430

June 15, 2026 invoker category_cve

8.7 / 10

HIGH

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

Description

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.

This 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.

'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.

This issue affects grpc: from 0.4.0 before 1.0.0.

AI Analysis

Denial of Service via gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1

Basic Information

ID CVE-2026-53430

Source EEF

Published Jun 15, 2026 at 21:55

Affected Product

Vendor elixir-grpc

Product grpc

Version 0.4.0

Affected Versions elixir-grpc grpc 0.4.0
elixir-grpc grpc beae6800fc8baf126f3fe7107d86a50e105275ba

CWE Classification

CWE-409

AI Assessment

AI Score 8.7 / 10

AI Severity High

Vendor elixir-grpc

Product grpc

Version 0.4.0

References

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    "published": "2026-06-15T21:55:33.707Z",
    "modified": "2026-06-15T21:55:33.707Z",
    "type": "cve",
    "title": "grpc gzip decompression bomb in GRPC.Compressor.Gzip.decompress/1",
    "source": "EEF",
    "references": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-6ccx-9c9f-327w\nhttps://cna.erlef.org/cves/CVE-2026-53430.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-53430\nhttps://github.com/elixir-grpc/grpc/commit/1afbab9d57d2a3e16ca9c62ffa4923338ea96cfc",
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