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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.

PUBLISHED Reserved 2026-05-25 | Published 2026-05-26 | Updated 2026-05-26 | Assigner VulDB




MEDIUM: 6.3CVSS: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
HIGH: 7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
HIGH: 7.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
7.5AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Problem types

Improper Validation of Specified Type of Input

Improper Input Validation

Product status

5.2.0
affected

5.2.1
affected

5.2.2
affected

5.2.3
affected

5.2.4
affected

5.2.5
unaffected

Timeline

2026-05-25:Advisory disclosed
2026-05-25:VulDB entry created
2026-05-25:VulDB entry last update

Credits

trebledj (VulDB User) reporter

References

vuldb.com/vuln/365541 (VDB-365541 | fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input) vdb-entry technical-description

vuldb.com/vuln/365541/cti (VDB-365541 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/814457 (Submit #814457 | fraillt bitsery 5.2.4 CWE-1287, CWE-843 (Type Confusion)) third-party-advisory

gist.github.com/TrebledJ/750abc64a826f19dd2d6774724629b71 exploit

github.com/fraillt/bitsery/blob/master/CHANGELOG.md release-notes

github.com/...ommit/66d16516e24893bebc1c8af52bf2fe9ad0735061 patch

github.com/fraillt/bitsery/releases/tag/v5.2.5 patch

github.com/fraillt/bitsery/ product

cve.org (CVE-2026-9521)

nvd.nist.gov (CVE-2026-9521)

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