CVE-2026-33666: CWE-190: Integer Overflow or Wraparound in ndsev zserio
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.
AI Analysis
Technical Summary
The ndsev zserio framework prior to version 2.18.1 contains an integer overflow vulnerability (CWE-190) in BitStreamReader.h's readBytes() and readString() functions. Specifically, the setBitPosition() function's bounds check is bypassed due to an overflowed value, resulting in the code attempting to read a large amount of data (512 MB) from a small buffer. This causes a segmentation fault, impacting availability. The vulnerability affects versions up to 2.15.0 and has been addressed in version 2.18.1.
Potential Impact
Exploitation of this vulnerability results in a denial of service condition due to a segmentation fault caused by reading beyond the buffer limits. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to ndsev zserio version 2.18.1 or later, where this vulnerability is fixed. Patch status is not explicitly stated in the vendor advisory, but the description confirms the issue is resolved in 2.18.1. Until upgrading, avoid processing untrusted data with affected versions to prevent potential crashes.
CVE-2026-33666: CWE-190: Integer Overflow or Wraparound in ndsev zserio
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.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The ndsev zserio framework prior to version 2.18.1 contains an integer overflow vulnerability (CWE-190) in BitStreamReader.h's readBytes() and readString() functions. Specifically, the setBitPosition() function's bounds check is bypassed due to an overflowed value, resulting in the code attempting to read a large amount of data (512 MB) from a small buffer. This causes a segmentation fault, impacting availability. The vulnerability affects versions up to 2.15.0 and has been addressed in version 2.18.1.
Potential Impact
Exploitation of this vulnerability results in a denial of service condition due to a segmentation fault caused by reading beyond the buffer limits. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to ndsev zserio version 2.18.1 or later, where this vulnerability is fixed. Patch status is not explicitly stated in the vendor advisory, but the description confirms the issue is resolved in 2.18.1. Until upgrading, avoid processing untrusted data with affected versions to prevent potential crashes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-23T15:23:42.220Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ebb81d87115cfb68646f70
Added to database: 4/24/2026, 6:36:13 PM
Last enriched: 5/1/2026, 8:34:21 PM
Last updated: 6/9/2026, 2:18:10 PM
Views: 63
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