CVE-2026-75348 Denial of service in n/a
A remote attacker can cause a denial of service in OpENer by sending malformed EtherNet/IP packets that trigger an out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75348?
CVE-2026-75348 is a high-severity denial of service vulnerability in n/a, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds read vulnerability exists in EIPStackGroup OpENer v2.3 and master up to commit 76b95cf in the EtherNet/IP TCP SendRRData Common Packet Format parser. The issue occurs in CreateCommonPacketFormatStructure() when it parses recognized optional socket address information items of type 0x8000 or 0x8001 without first validating that the remaining CPF buffer contains the complete fixed sockaddr structure. This allows a remote attacker to cause a denial of service.
Weakness: CWE-125
Which versions are affected by CVE-2026-75348?
How do I fix CVE-2026-75348?
No fix has been published for CVE-2026-75348 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-75348 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75348 exists.
Sources
Also known as GHSA-h42x-559x-q66g.