CVE-2026-33524
Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-789 |
| Vendor | ndsev |
| Product | zserio |
| Published | Apr 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ndsev / zserio
< 2.18.1