CVE-2026-33666 | THREATINT

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.

PUBLISHED Reserved 2026-03-23 | Published 2026-04-24 | Updated 2026-04-27 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-190: Integer Overflow or Wraparound

Product status

<= 2.15.0

affected

References

github.com/...zserio/security/advisories/GHSA-fjwv-6wcr-vqwj exploit

github.com/...zserio/security/advisories/GHSA-fjwv-6wcr-vqwj

cve.org (CVE-2026-33666)

nvd.nist.gov (CVE-2026-33666)

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