What’s Vulnerable › Vulnerabilities
CVE-2026-33524: Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-04-24 · updated 2026-10-26
- Weakness: CWE-789
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.
Affected products
- ndsev zserio: before 2.18.1 — fixed in 2.18.1
How to fix
Upgrade to a fixed version: ndsev zserio 2.18.1. Check the vendor advisory for mitigations.
References
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