CVE-2026-9521

fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input

State: Published
Severity: 6.3 Medium
Published: May 26, 2026
Updated: May 26, 2026
Reserved: May 25, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	7.3 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	7.5 High	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-1287 Improper Validation of Specified Type of Input
CWE-20 Improper Input Validation

Affected Products

Product	Versions
bitseryfraillt	5.2.0Affected 5.2.1Affected 5.2.2Affected 5.2.3Affected 5.2.4Affected 5.2.5Not affected

References

VDB-365541 | fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of inputvdb-entrytechnical-description
VDB-365541 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #814457 | fraillt bitsery 5.2.4 CWE-1287, CWE-843 (Type Confusion)third-party-advisory
https://gist.github.com/TrebledJ/750abc64a826f19dd2d6774724629b71exploit
https://github.com/fraillt/bitsery/blob/master/CHANGELOG.md#525-2025-10-09release-notes
https://github.com/fraillt/bitsery/commit/66d16516e24893bebc1c8af52bf2fe9ad0735061patch
https://github.com/fraillt/bitsery/releases/tag/v5.2.5patch
https://github.com/fraillt/bitsery/product

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