ndsev zserio up to 2.18.0 BitStreamReader.h readBytes/readString/setBitPosition integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in ndsev zserio up to 2.18.0. This issue affects the function readBytes/readString/setBitPosition in the library BitStreamReader.h. Performing a manipulation results in integer overflow. This vulnerability is reported as CVE-2026-33666. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in ndsev zserio up to 2.18.0. This affects the function readBytes/readString/setBitPosition in the library BitStreamReader.h. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33666 since 03/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 2.18.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25593). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• ndsev

Name

• zserio

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18.0

Website

• Product: https://github.com/ndsev/zserio/

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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