Zserio: Integer Overflow in BitStreamReader on 32-bit platforms_CVE-2026-33666

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-33666

Source GitHub_M

Published Apr 24, 2026 at 18:21

Affected Product

Vendor ndsev

Product zserio

Version <= 2.15.0

Affected Versions ndsev zserio <= 2.15.0

CWE Classification

CWE-190

References

github.com /ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj

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    "published": "2026-04-24T18:21:11.265Z",
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