Integer overflow in Nds-Association Zserio
CVE-2026-33666
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Nds-Association Zserio
- Ndsev Zserio — versions <= 2.15.0
Weakness classification (CWE)
References
- github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33666?
- CVE-2026-33666 is a high-severity vulnerability in Nds-Association Zserio, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-04-24.
- How severe is CVE-2026-33666?
- High severity. CVSS v3 base score is 7.5 out of 10.