CVE-2026-51536 Integer overflow in n/a
A malicious CIP packet can trigger an integer overflow leading to a stack buffer overflow, allowing remote code execution or denial of service in OpENer.
- 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-2026-51536?
CVE-2026-51536 is a critical vulnerability in n/a, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In OpENer 2.3.0 (commit 76b95cf) when parsing incoming CIP (Common Industrial Protocol) network packets, the length parameter is inconsistently typed across the call stack. Specifically, an upstream length calculated as an int is passed to a downstream function that expects an EipInt16 (a 16-bit signed integer). If a maliciously crafted packet with specific length fields is processed, the length parameter can overflow or be truncated into a negative value. This negative length bypasses subsequent bounds checking (due to signed/unsigned comparison issues) and is ultimately used in memory operations, leading to a Stack Buffer Overflow when reading data in DecodePaddedEPath.
Weakness: CWE-190
Which versions are affected by CVE-2026-51536?
It affects 1 product.
Products include Opener Project Opener.
How do I fix CVE-2026-51536?
No fix has been published for CVE-2026-51536 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-51536 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51536 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-wfpp-whc2-qj45.