PT-2026-43178 · Fraillt · Bitsery

Trebledj · Published 2026-05-26 · Updated 2026-05-26 · CVE-2026-9521

Mitre

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Exploit

Fix

RCE

Weakness Enumeration

CWE-1287

CWE-20

Related Identifiers

CVE-2026-9521

Affected Products

Bitsery

References · 8

• 🔥 https://gist.github.com/TrebledJ/750abc64a826f19dd2d6774724629b71 · Exploit
• https://github.com/fraillt/bitsery/commit/66d16516e24893bebc1c8af52bf2fe9ad0735061 · Patch
• https://github.com/fraillt/bitsery/releases/tag/v5.2.5 · Patch
• https://vuldb.com/submit/814457 · Note
• https://github.com/fraillt/bitsery/blob/master/CHANGELOG.md#525-2025-10-09 · Note
• https://vuldb.com/vuln/365541/cti · Note
• https://vuldb.com/vuln/365541 · Note
• https://github.com/fraillt/bitsery · Note