CVE-2026-59803 – rpcx – Denial of Service via Gzip Decompression Bomb in Wire Protocol

CVE ID :CVE-2026-59803

Published : July 8, 2026, 7:42 p.m. | 6 minutes ago

Description :rpcx through 1.9.3, fixed in commit 047aec1, contains a denial-of-service vulnerability in protocol.Message.Decode (protocol/message.go). When a message has the compression flag set, the payload is gzip-decompressed via util.Unzip with no limit on the decompressed output size. The only built-in size guard, protocol.MaxMessageLength, is checked against the compressed on-the-wire frame length, not the decompressed size, so it provides no protection. Because decoding (and decompression) occurs in readRequest before authentication, a single unauthenticated connection can send a small (under 2 MB) gzip-compressed message that expands to gigabytes of heap allocation, leading to out-of-memory conditions and service unavailability.

Severity: 8.7 | HIGH

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