CVE-2026-9521— fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input
Quick assessment
Affected
fraillt bitsery
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.
Bitsery是Mindaugas Vinkelis个人开发者的一款C++二进制序列化库。 Bitsery 5.2.4及之前版本存在安全漏洞，该漏洞源于include/bitsery/ext/std_smart_ptr.h库中loadFromSharedState函数对指定输入类型验证不当，可能导致远程攻击。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-9521
Vulnerability Information
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Vulnerability Title
fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in fraillt bitsery up to 5.2.4. Affected is the function loadFromSharedState in the library include/bitsery/ext/std_smart_ptr.h. Such manipulation leads to improper validation of specified type of input. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 5.2.5 is able to address this issue. The name of the patch is 66d16516e24893bebc1c8af52bf2fe9ad0735061. Upgrading the affected component is advised.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
Source: CVE Program / CVE List V5
Vulnerability Title
Bitsery 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bitsery是Mindaugas Vinkelis个人开发者的一款C++二进制序列化库。 Bitsery 5.2.4及之前版本存在安全漏洞，该漏洞源于include/bitsery/ext/std_smart_ptr.h库中loadFromSharedState函数对指定输入类型验证不当，可能导致远程攻击。
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
II. Public POCs for CVE-2026-9521
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Qwen3.6-35B-A3B
· 8530 chars
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III. Intelligence Information for CVE-2026-9521
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Patches & Fixes for CVE-2026-9521 (2)
Proof of Concept for CVE-2026-9521 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-9521
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