Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization
Priority LOW 39CWE-789Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-789.
Summary
Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-08
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed zserio (ndsev): 2.18.1io.github.ndsev:zserio-runtime (Maven): 2.18.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ndsev | zserio | before 2.18.1 | 2.18.1 | Patch available | CNA |
| — | io.github.ndsev:zserio-runtime (Maven) | before 2.18.1 | 2.18.1 | Patch available | GHSA-cwq5-8pvq-j65j |
- zserio Vendorndsev Affected before 2.18.1 Fixed in 2.18.1 Patch available CNA
- io.github.ndsev:zserio-runtime (Maven) Vendor— Affected before 2.18.1 Fixed in 2.18.1 Patch available GHSA-cwq5-8pvq-j65j
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:* | before 2.18.1 | Vulnerable | Nds-association |
- cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:* Versions before 2.18.1 Vulnerable ·Nds-association
Remediation
- Fix · CNA zserio (ndsev) Fixed in 2.18.1
- Fix · GHSA-cwq5-8pvq-j65j io.github.ndsev:zserio-runtime (Maven) Fixed in 2.18.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33524
- 2026-10-03 Alias added: GHSA-cwq5-8pvq-j65j
References
More Nds-association Zserio vulnerabilities
- TI-2026-26046 Zserio: Integer Overflow in BitStreamReader on 32-bit platforms CVSS 3.1HIGH 7.5
Sources
- CVE-2026-33524 · CVE Program
- CVE-2026-33524 · NVD
- FIRST EPSS
- GHSA-cwq5-8pvq-j65j · GitHub Advisory Database · CC BY 4.0
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