What is CVE-2026-9521?

CVE-2026-9521 is a high-severity vulnerability in Fraillt Bitsery, classified under Improper Input Validation. CVSS score: 7.3/10. Published 2026-05-26.

How severe is CVE-2026-9521?

High severity. CVSS v3 base score is 7.3 out of 10.

Improper input validation in Fraillt Bitsery

CVE-2026-9521

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…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Fraillt Bitsery — versions 5.2.0, 5.2.1, 5.2.2

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (exploit)
cna@vuldb.com (release-notes)
cna@vuldb.com (patch)
cna@vuldb.com (patch)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-9521?: CVE-2026-9521 is a high-severity vulnerability in Fraillt Bitsery, classified under Improper Input Validation. CVSS score: 7.3/10. Published 2026-05-26.
How severe is CVE-2026-9521?: High severity. CVSS v3 base score is 7.3 out of 10.