CVE-2026-33666: Nds-Association Zserio

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Nds-Association Zserio: before 2.18.1 (fixed in 2.18.1)

Published 2026-04-24. Last modified 2026-06-17.