CVE-2026-127122
Out-of-bounds write with too many MCR blocks in a Connect request
Description
P-Net before 1.0.4 does not check the number of MCR request blocks in a Connect request against the number of multicast communication relations that an Application Relationship has room for (PNET_MAX_MC_CR, 1 by default). Each further block is written past the end of the array, into the rest of the Application Relationship and, with more blocks, into the following one. The written data comes from the request. No established Application Relationship is needed, and the attacker requires ADJACENT network access. Builds with PNET_OPTION_MC_CR disabled are not affected.
INFO
Published Date :
Nov. 13, 2026, 1:24 p.m.
Last Modified :
Nov. 13, 2026, 1:24 p.m.
Remotely Exploit :
No
Source :
rt-labs
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 4b71179a-3b92-4a9d-b9fc-af8b8ed579ee |
Solution
- Update P-Net to version 1.0.4 or later.
- Recompile with PNET_OPTION_MC_CR disabled if update is not possible.
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