CVE-2026-33666
CVE-2026-33666 is a high-severity vulnerability in Nds-association Zserio with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 0% (25th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-25593
- Weakness: CWE-190
- Affected product: Nds-association Zserio
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2026-33666?
- CVE-2026-33666 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-33666 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-33666?
- CVE-2026-33666 affects Nds-association Zserio. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-33666?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-33666 have an EU (EUVD) identifier?
- Yes. CVE-2026-33666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25593.
- When was CVE-2026-33666 published?
- CVE-2026-33666 was published on 2026-04-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:*
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