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CriticalVulnerabilityCVE-2026-111732updated 29 Oct 2026, 16:20 UTC

P-Net industrial network stack can crash or be hijacked by crafted requests

A flaw in P-Net, a networking library used in industrial devices, lets a specially crafted connection request write data past the memory it should stay within. This can crash the device or, in the worst case, let an attacker run their own c

Fixed in P-Net 1.0.3 or later.Official source
SeverityCriticalCVSS 9.3 of 10
Being exploited?UnclearNo reports either way yet
Fix available?YesP-Net 1.0.3 or later. · since 29 Oct 2026
How sure is this?Official sourceBacked by an official source

How the attack works simplified

  1. 1Attacker sends requestCrafted Connect request to the device
  2. 2Request reaches deviceParsed by the ARVendorBlock handler
  3. 3Unchecked length usedLength field not validated against buffer size
  4. 4Out-of-bounds writeMemory beyond buffer is overwritten
  5. 5Crash or code executionDevice stops or runs attacker code
  6. ResultDevice crashes or attacker runs code

What happened

In P-Net before 1.0.3, built with PNET_OPTION_AR_VENDOR_BLOCKS enabled, the ARVendorBlock handling copies a length-specified number of bytes from a Connect request into a fixed-size buffer without checking bounds, causing an out-of-bounds write.

Why it is dangerous: A remote attacker sending a crafted Connect request can crash the device (denial of service) or potentially execute arbitrary code, which matters for industrial control equipment on the network.

Are you affected?

You are affected if you run P-Net before 1.0.3 built with the PNET_OPTION_AR_VENDOR_BLOCKS option enabled (disabled by default).

P-Net versions before 1.0.3, only when built with PNET_OPTION_AR_VENDOR_BLOCKS enabled.

What to do

  1. Update P-Net to version 1.0.3 or later
  2. If you cannot update immediately, rebuild without PNET_OPTION_AR_VENDOR_BLOCKS enabled, since the option is off by default
  3. Limit network access to affected industrial devices to trusted hosts

Timeline

  1. 29 Oct 2026, 16:17 UTC
    Publicly disclosed
  2. 29 Oct 2026, 16:17 UTC
    Reported by NVD · NVD
  3. 29 Oct 2026, 16:20 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-111732
CVSS
9.3 / 10
Disclosed
29 Oct 2026, 16:17 UTC
On Zero Radar
29 Oct 2026, 16:20 UTC (2 min after disclosure)
Last change
29 Oct 2026, 16:20 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

P-Net industrial network stack can crash or be hijacked by crafted requests · Zero Radar