Out-of-Bounds Read in OpENer CPF Parser

Publication date: 2026-05-18

Last updated on: 2026-05-18

Assigner: MITRE

Description

OpENer v2.3-558-g1e99582 contains an out-of-bounds read vulnerability in the Common Packet Format (CPF) parser, specifically in CreateCommonPacketFormatStructure() in source/src/enet_encap/cpf.c. A crafted ENIP/CPF message can supply an attacker-controlled item_count value that is not consistently validated against the remaining data_length of the CPF slice

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-18

Last Modified

2026-05-18

Generated

2026-06-30

AI Q&A

2026-05-19

EPSS Evaluated

2026-06-28

NVD

CVE-2026-38719

Affected Vendors & Products

Vendor	Product	Version / Range
opener	opener	2.3-558-g1e99582

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability exists in OpENer version v2.3-558-g1e99582 within the Common Packet Format (CPF) parser. Specifically, the function CreateCommonPacketFormatStructure() does not properly validate an attacker-controlled item_count value against the remaining data length of the CPF slice. This leads to an out-of-bounds read, where the software reads memory outside the intended buffer.

Impact Analysis

The vulnerability can cause an out-of-bounds read, which may lead to a denial of service (DoS) by crashing the affected application or system. According to the CVSS score (6.2), the impact is primarily on availability, with no direct impact on confidentiality or integrity.

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