Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
smallnest rpcx
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

smallnest rpcx是中国smallnest个人开发者的一款基于Go语言的RPC框架。 smallnest rpcx 1.9.3及之前版本存在资源管理错误漏洞，该漏洞源于对协议消息解码时，未对Gzip解压输出大小进行限制，导致未经身份验证的攻击者通过网络发送特制的小压缩消息，可造成大量堆内存分配，从而引发拒绝服务。

CVSS 7.5 · High EPSS 0.74% · P54

Affected Version Matrix 2

VendorProduct Version RangeStatus
smallnest rpcx ≤ 1.9.3 affected
047aec18efa7d037105e2b72c36dd2ae05e1acc6 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-59803

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
smallnest rpcx 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
smallnest rpcx是中国smallnest个人开发者的一款基于Go语言的RPC框架。 smallnest rpcx 1.9.3及之前版本存在资源管理错误漏洞，该漏洞源于对协议消息解码时，未对Gzip解压输出大小进行限制，导致未经身份验证的攻击者通过网络发送特制的小压缩消息，可造成大量堆内存分配，从而引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
smallnest rpcx 0 ~ 1.9.3 -

II. Public POCs for CVE-2026-59803

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6975 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-59803

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-59803 (2)

Vendor Advisories for CVE-2026-59803 (2)

IV. Related Vulnerabilities

Same weakness: CWE-409

V. Comments for CVE-2026-59803

No comments yet

Leave a comment