# CVE-2026-33666

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-33666
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-190

## Affected products

- `nds-association:zserio`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33666

## Citation

> AI Analytics. CVE-2026-33666. Retrieved 2026-07-15 from https://api.ai-analytics.org/cve/CVE-2026-33666. Derived from NIST NVD. Licensed CC0.

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