CVE-2026-33524Network attack vector

Process crash via unchecked deserialization lengths

Published Apr 24, 2026 · Updated Apr 24, 2026

Memory exhaustion in zserio before 2.18.1 allows remote attackers to crash deserializing processes via a crafted binary payload. The C++ Array and BitStreamReader paths reserve attacker-declared lengths without checking remaining stream bytes, while Java Array and ByteArrayBitStreamReader allocate arrays from the same unchecked values. Any application that deserializes untrusted zserio data can exhaust memory from a 4-5-byte payload, interrupting that process without affecting confidentiality or integrity.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in zserio before 2.18.1 allows remote attackers to crash deserializing processes via a crafted binary payload. The C++ Array and BitStreamReader paths reserve attacker-declared lengths without checking remaining stream bytes, while Java Array and ByteArrayBitStreamReader allocate arrays from the same unchecked values. Any application that deserializes untrusted zserio data can exhaust memory from a 4-5-byte payload, interrupting that process without affecting confidentiality or integrity.

The record

CVE
CVE-2026-33524
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
Navigation Data Standard (NDS) e.V.
Product
zserio
Classifications
CWE-789, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Navigation Data Standard (NDS) e.V. · zserioversion=< 2.18.1

Published CVSS scores

7.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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