VULNERABILITY INTELLIGENCE

CVE-2026-33666

CVSS score7.5 HIGH
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-04-24
Last modified2026-10-26
CVSS vectorCVSS: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.

Weakness classification

  • security-advisories@github.com: CWE-190

Primary references