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 vulnerability in ndsev zserio (CVE-2026-33666) involves an integer overflow in the setBitPosition() bounds check inside BitStreamReader.h's readBytes() and readString() functions. When an overflow occurs, the bounds check is bypassed, allowing the code to read a large amount of data (512 MB) from a small buffer, resulting in a segmentation fault. This issue affects versions up to 2.15.0 and was resolved in version 2.18.1.
Potential Impact
The vulnerability causes a denial of service through a segmentation fault by reading beyond the buffer limits due to an integer overflow. There is no indication of confidentiality or integrity impact, only availability is affected.
Mitigation Recommendations
A fix for this vulnerability is available in ndsev zserio version 2.18.1. Users should upgrade to version 2.18.1 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory, but the description confirms the vulnerability is fixed in 2.18.1.
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in ndsev zserio (CVE-2026-33666) involves an integer overflow in the setBitPosition() bounds check inside BitStreamReader.h's readBytes() and readString() functions. When an overflow occurs, the bounds check is bypassed, allowing the code to read a large amount of data (512 MB) from a small buffer, resulting in a segmentation fault. This issue affects versions up to 2.15.0 and was resolved in version 2.18.1.
Potential Impact
The vulnerability causes a denial of service through a segmentation fault by reading beyond the buffer limits due to an integer overflow. There is no indication of confidentiality or integrity impact, only availability is affected.
Mitigation Recommendations
A fix for this vulnerability is available in ndsev zserio version 2.18.1. Users should upgrade to version 2.18.1 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory, but the description confirms the vulnerability is fixed in 2.18.1.
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: 4/24/2026, 6:51:18 PM
Last updated: 4/25/2026, 5:45:20 AM
Views: 9
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