Is there a public exploit for CVE-2026-127122?

No public exploit for CVE-2026-127122 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-127122?

CVE-2026-127122 scores CVSS 7.2 (v4.0), rated high.

What does CVE-2026-127122 affect?

CVE-2026-127122 affects RT-Labs P-Net.

7.2 High

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…

CVE-2026-127122

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 (PNETMAXMCCR, 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 PNETOPTIONMCCR disabled are not affected.

Assessment

CVSS: 7.2 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: RT-Labs · P-Net
Assigner: rt-labs

CVSS vectorCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://rt-labs.com/wp-content/uploads/2026/11/RRTL-261109-01.pdf

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