CVE-2026-33524

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

State: Published
Severity: 7.5 High
Published: Apr 24, 2026
Updated: Apr 27, 2026
Reserved: Mar 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
zseriondsev	< 2.18.1Affected

References

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

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