CVE-2026-111736: P-Net NULL pointer dereference in implicit read request handling

CVE-2026-111736 · Severity: info · Published 2026-10-29

P-Net is a PROFINET communication library used in industrial automation devices. A remote attacker can send a specially crafted implicit read request that causes a NULL pointer dereference, crashing the device and disrupting operations. No authentication is required to trigger the vulnerability.

Technologies: RT-Labs P-Net. Vendors: RT-Labs.

Quick answers

Is CVE-2026-111736 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-111736 being exploited in the wild.
How severe is CVE-2026-111736?
Informational severity, published 29 October 2026.
Which products and versions are affected?
RT-Labs P-Net before 1.0.3.
Is there a fix for CVE-2026-111736?
Yes: fixed in P-Net 1.0.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-111736 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-111736?
Check whether you run RT-Labs P-Net at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: P-Net 1.0.3

Technical details

The vulnerability exists in the pf_fspm_cm_read_ind() function, where a NULL AR (Active Relationship) pointer is dereferenced when processing an implicit read request without a valid target AR UUID for a user-specific record index. This occurs only if the application has registered a read callback. A remote unauthenticated attacker can trigger a denial of service by crashing the device.

Affected products

  • RT-Labs P-Net before 1.0.3

Timeline

  • 2026-10-29: disclosed

References

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