CVE-2026-33524

HIGH

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

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, 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)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0032
EPSS Percentile 23.6%
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 (3)
io.github.ndsev/zserio-runtime 0 - 2.18.1Maven
nds-association/zserio < 2.18.1
ndsev/zserio < 2.18.1
Published Apr 24, 2026
Tracked Since Apr 24, 2026