Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1.
History

Mon, 27 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Ndsev
Ndsev zserio
Vendors & Products Ndsev
Ndsev zserio

Mon, 27 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 24 Apr 2026 18:30:00 +0000

Type Values Removed Values Added
Description Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1.
Title Zserio: Integer Overflow in BitStreamReader on 32-bit platforms
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-24T18:21:11.265Z

Updated: 2026-04-27T13:46:01.833Z

Reserved: 2026-03-23T15:23:42.220Z

Link: CVE-2026-33666

cve-icon Vulnrichment

Updated: 2026-04-27T13:45:47.937Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-24T19:17:10.147

Modified: 2026-04-27T18:57:20.293

Link: CVE-2026-33666

cve-icon Redhat

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