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2 vulnerabilities by smallnest
CVE-2026-59803 (GCVE-0-2026-59803)
Vulnerability from nvd – Published: 2026-07-08 19:42 – Updated: 2026-07-09 13:30 X_Open Source
VLAI
EPSS
VEX
Title
rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol
Summary
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
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/smallnest/rpcx/issues/942 | technical-descriptionexploit |
| https://github.com/smallnest/rpcx/pull/943 | issue-tracking |
| https://github.com/smallnest/rpcx/commit/047aec18… | patch |
| https://www.vulncheck.com/advisories/rpcx-denial-… | third-party-advisory |
Impacted products
Date Public
2026-07-06 00:00
Credits
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CVE-2026-59803 (GCVE-0-2026-59803)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:42 – Updated: 2026-07-09 13:30 X_Open Source
VLAI
EPSS
VEX
Title
rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol
Summary
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
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/smallnest/rpcx/issues/942 | technical-descriptionexploit |
| https://github.com/smallnest/rpcx/pull/943 | issue-tracking |
| https://github.com/smallnest/rpcx/commit/047aec18… | patch |
| https://www.vulncheck.com/advisories/rpcx-denial-… | third-party-advisory |
Impacted products
Date Public
2026-07-06 00:00
Credits
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