CVE-2026-51536
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.
- Affected products
- Openemr
- Opener Project Opener
- = 2.3.0
- CVSS 3.1
- 9.1 CRITICAL
- EPSS
- 0.5% (38th percentile)
- Weakness
- CWE-190
- NVD status
- Analyzed
- Published
- 2026-07-13
No indexed exploits for CVE-2026-51536 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-51536 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.