CVE-2026-33666CWE-190

Zserio: Integer Overflow in BitStreamReader on 32-bit platforms

High · published April 24, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
41.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00498 · 41.8th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-04-24T18:21Z
EPSS history
Timeline
  • 24 APR 18:21Z
    Zserio: Integer Overflow in BitStreamReader on 32-bit platforms
    cvelistv5