CVE-2026-33666
Last modified
CVE-2026-33666 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nds-Association | Zserio | < 2.18.1 |
References
- https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwjExploit, Mitigation, Vendor Advisory
- https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwjExploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-33666?
How severe is CVE-2026-33666?
How do I fix CVE-2026-33666?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-33660n8n is an open source workflow automation platform. Prior to…8.8
- CVE-2026-33661Pay is an open-source payment SDK extension package for vari…7.5
- CVE-2026-33662OP-TEE is a Trusted Execution Environment (TEE) designed as …7.5
- CVE-2026-33663n8n is an open source workflow automation platform. Prior to…6.5
- CVE-2026-33664Kestra is an open-source, event-driven orchestration platfor…5.4
- CVE-2026-33665n8n is an open source workflow automation platform. Prior to…7.5
- CVE-2026-33667OpenProject is an open-source project management application…7.4
- CVE-2026-33668Vikunja is an open-source self-hosted task management platfo…8.1
- CVE-2026-33669SiYuan is a personal knowledge management system. Prior to v…7.5
- CVE-2026-3367The Lockme OAuth2 calendars integration plugin for WordPress…4.4
- CVE-2026-33670SiYuan is a personal knowledge management system. Prior to v…7.5
- CVE-2026-33671Picomatch is a glob matcher written JavaScript. Versions pri…7.5
Are you affected by CVE-2026-33666?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST