U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-9521 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  VulDB
CVSS-BT 2.9 LOW
Vector:  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

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)
https://gist.github.com/TrebledJ/750abc64a826f19dd2d6774724629b71 VulDB
https://github.com/fraillt/bitsery/ VulDB
https://github.com/fraillt/bitsery/blob/master/CHANGELOG.md#525-2025-10-09 VulDB
https://github.com/fraillt/bitsery/commit/66d16516e24893bebc1c8af52bf2fe9ad0735061 VulDB
https://github.com/fraillt/bitsery/releases/tag/v5.2.5 VulDB
https://vuldb.com/submit/814457 VulDB
https://vuldb.com/vuln/365541 VulDB
https://vuldb.com/vuln/365541/cti VulDB

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation VulDB  
CWE-1287 Improper Validation of Specified Type of Input VulDB  

Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-9521
NVD Published Date:
05/25/2026
NVD Last Modified:
07/23/2026
Source:
VulDB