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CVE-2026-33666

Nds-association Zserio integer overflow

7.5 HIGHPublic exploitEPSS 0.50%
  1. Published24 Apr 2026

Description

Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Nds-association Zserio< 2.18.1

Remediation

Fixed in
Nds-association Zserio≥ 2.18.1

References

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Frequently asked

Is CVE-2026-33666 being actively exploited?

CVE-2026-33666 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.50%.

How severe is CVE-2026-33666?

CVE-2026-33666 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2026-33666?

Affected products include Nds-association Zserio.

How do I fix CVE-2026-33666?

Upgrade affected software to a fixed version, for example Nds-association Zserio 2.18.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.