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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj	Exploit Mitigation Vendor Advisory
https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-24 19:17

Updated : 2026-06-17 10:37

NVD link : CVE-2026-33666

Mitre link : CVE-2026-33666

CVE.ORG link : CVE-2026-33666

JSON object : View

Products Affected

nds-association

zserio

CWE

CWE-190

Integer Overflow or Wraparound

{"id": "CVE-2026-33666", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33666", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-27T13:45:58.519906Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ndsev", "product": "zserio", "versions": [{"status": "affected", "version": "<= 2.15.0"}]}]}], "published": "2026-04-24T19:17:10.147", "references": [{"url": "https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-190"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-06-17T10:37:53.463", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nds-association:zserio:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5488B9D1-04B2-459B-BE23-2FF4A91D12CF", "versionEndExcluding": "2.18.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}