CVE-2026-33524

HIGH

Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization

Title source: cna

Description

Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.

References (1)

[X_Refsource_Confirm] https://github.com/ndsev/zserio/security/advisories/GHSA-cwq5-8pvq-j65j

Scores

CVSS v3 7.5

EPSS 0.0006

EPSS Percentile 17.0%

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 none

Automatable yes

Technical Impact partial

Details

CWE

CWE-789

Status published

Products (2)

nds-association/zserio < 2.18.1

ndsev/zserio < 2.18.1

Published Apr 24, 2026

Tracked Since Apr 24, 2026