CVE-2026-59803

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Source
https://cve.org/CVERecord?id=CVE-2026-59803
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59803.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59803
Published
2026-07-08T19:42:29.448Z
Modified
2026-07-15T01:48:51.642207774Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59803.json"
}
References

Affected packages

Git / github.com/smallnest/rpcx

Affected ranges

Type
GIT
Repo
https://github.com/smallnest/rpcx
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d924ffd970626e76a7e48c2b77cd8599f675fd41
Fixed
047aec18efa7d037105e2b72c36dd2ae05e1acc6
Database specific 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.9.3"
        }
    ]
}

Affected versions

v1.*
v1.4.1
v1.6.10
v1.6.11
v1.6.12
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8
v1.6.9
v1.7.0
v1.7.1
v1.7.10
v1.7.11
v1.7.12
v1.7.13
v1.7.14
v1.7.15
v1.7.2
v1.7.3
v1.7.4
v1.7.5
v1.7.6
v1.7.7
v1.7.8
v1.7.9
v1.8.0
v1.8.1
v1.8.10
v1.8.11
v1.8.12
v1.8.13
v1.8.14
v1.8.15
v1.8.16
v1.8.17
v1.8.18
v1.8.2
v1.8.20
v1.8.21
v1.8.22
v1.8.23
v1.8.24
v1.8.25
v1.8.26
v1.8.27
v1.8.28
v1.8.29
v1.8.3
v1.8.30
v1.8.31
v1.8.32
v1.8.33
v1.8.34
v1.8.35
v1.8.36
v1.8.37
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.8.8
v1.8.9
v1.9.0
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59803.json"