CVE-2026-59803
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk54th percentile - higher than 54% of all known CVEs
Summary
A denial-of-service vulnerability in rpcx through version 1.9.3 allows an unauthenticated attacker to send a small gzip-compressed message that decompresses to gigabytes, causing out-of-memory conditions and service unavailability. The issue is in protocol.Message.Decode, where decompressed size is not limited, and the MaxMessageLength check only applies to the compressed frame size.
Risk Assessment
An unauthenticated attacker can cause memory exhaustion and complete service unavailability with a single small packet (under 2 MB), posing a serious risk to service continuity.
Recommendation
Immediately update rpcx to a version containing commit 047aec1 or later, which introduces a limit on decompressed data size.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

