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CVE-2026-9521

7.3 · HIGH

A security vulnerability has been detected in fraillt bitsery up to 5.2.4.

Published May 26, 2026CWE-20EPSS 0.54%

Overview

CVE-2026-9521 is a high-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgist.github.com/TrebledJ/750abc64a826f19dd2d6774724629b71GitHubgithub.com/fraillt/bitsery/GitHubgithub.com/fraillt/bitsery/blob/master/CHANGELOG.md#525-2025-10-09GitHubgithub.com/fraillt/bitsery/commit/66d16516e24893bebc1c8af52bf2fe9ad0735061GitHubgithub.com/fraillt/bitsery/releases/tag/v5.2.5Refvuldb.com/submit/814457Refvuldb.com/vuln/365541Refvuldb.com/vuln/365541/cti

How CyberStrike helps

Frequently asked questions

What is CVE-2026-9521?

CVE-2026-9521 is a high-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-9521?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-9521?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-9521?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-9521 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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