PT-2026-35056 · Ndsev · Zserio

Published 2026-04-24 · Updated 2026-04-24 · CVE-2026-33666

Mitre

CVSS v3.1

7.5

High

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

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.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-33666

Affected Products

Zserio

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-33666 · Security Note
• https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj · Note
• https://twitter.com/CVEnew/status/2047798581139321183 · Twitter Post