# CVE-2026-75348: EIPStackGroup OpENer out-of-bounds read in EtherNet/IP TCP parser

Source: https://junglewise.ai/threats/cve-2026-75348-an-out-of-bounds-read-vulnerability-exists-in-eipstackgroup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-75348 · Severity: high · CVSS 7.5 · Published 2026-10-09

OpENer is an open-source EtherNet/IP stack used in industrial control systems and devices. A flaw in how it parses certain network messages allows a remote attacker to read memory beyond intended bounds, causing the application to crash or potentially leak sensitive data, disrupting industrial automation systems.

Technologies: [EIPStackGroup OpENer](https://junglewise.ai/threats/technologies/opener). Vendors: [EIPStackGroup](https://junglewise.ai/threats/vendors/eipstackgroup).

## Quick answers

**Is CVE-2026-75348 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75348 being exploited in the wild.

**How severe is CVE-2026-75348?** High severity, with a CVSS score of 7.5, published 9 October 2026.

**Which products and versions are affected?** EIPStackGroup OpENer v2.3 and master up to commit 76b95cf.

**Is there a fix for CVE-2026-75348?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-75348 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-75348?** Check whether you run EIPStackGroup OpENer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read exists in the CreateCommonPacketFormatStructure() function when parsing EtherNet/IP Common Packet Format (CPF) messages with optional socket address items (types 0x8000 or 0x8001) over TCP. The parser does not validate that the remaining buffer contains the complete fixed sockaddr structure before reading it. A remote attacker can send a malformed CPF message over the network to trigger the vulnerability without authentication.

## Affected products

- EIPStackGroup OpENer v2.3 and master up to commit 76b95cf

## Timeline

- 2026-10-09: disclosed

## References

- [https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/cpf.c](https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/cpf.c)
- [https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/encap.c](https://github.com/EIPStackGroup/OpENer/blob/master/source/src/enet_encap/encap.c)

## Related threats

- [OpENer out-of-bounds read in EtherNet/IP ForwardOpen parser](https://junglewise.ai/threats/cve-2026-75353-opener-v2-3-commit-76b95cf-contains-an-out-of-bounds-read-in-the)
- [OpENer out-of-bounds read in ForwardOpen connection-path parser](https://junglewise.ai/threats/cve-2026-75351-opener-v2-3-commit-76b95cf-contains-an-out-of-bounds-read-in-the)
- [EIPStackGroup OpENer buffer overflow in GetAttributeList](https://junglewise.ai/threats/cve-2026-75350-eipstackgroup-opener-v2-3-master-commit-76b95cf-contains-a-buffer)
- [EIPStackGroup OpENer expired pointer dereference in EtherNet/IP CPF](https://junglewise.ai/threats/cve-2026-75347-eipstackgroup-opener-v2-3-and-master-up-to-commit-76b95cf-contain)
- [EIPStackGroup OpENer out-of-bounds read in Connection Manager](https://junglewise.ai/threats/cve-2026-75349-eipstackgroup-opener-v2-3-0-master-up-to-commit-76b95cf-contains)