CVE-2026-33666

HIGH

Zserio: Integer Overflow in BitStreamReader on 32-bit platforms

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 7.5
EPSS 0.0006
EPSS Percentile 17.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-190
Status published
Products (2)
nds-association/zserio < 2.18.1
ndsev/zserio <= 2.15.0
Published Apr 24, 2026
Tracked Since Apr 24, 2026