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CVE-2026-9521— fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input

CVSS 7.3 · High EPSS 0.07% · P21

Possible ATT&CK Techniques 1AI

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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1287
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
frailltbitsery 5.2.0 cpe:2.3:a:fraillt:bitsery:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9521

#POC DescriptionSource LinkShenlong Link
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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

Same weakness: CWE-1287

V. Comments for CVE-2026-9521

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