TI-2026-82626 Aliases CVE-2026-111732 GHSA-h967-v272-9m8r

Out-of-bounds write when parsing AR Vendor Block requests in RT-Labs P-Net

MEDIUM 48CWE-787Published 2026-10-29 · Updated 2026-11-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

RT-Labs P-Net before 1.0.3 is affected when built with PNET_OPTION_AR_VENDOR_BLOCKS enabled, an option that is disabled by default. The ARVendorBlock request handling takes a data length from a field outside the block definition and copies that many bytes into a fixed-size buffer without a bounds check (CWE-787). An unauthenticated remote attacker can send a crafted Connect request to cause an out-of-bounds write, which can crash the device (denial of service) or potentially allow arbitrary code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

P-Net before 1.0.3, when built with PNET_OPTION_AR_VENDOR_BLOCKS enabled, parses a data length from a field of the ARVendorBlock request that is not part of the block definition and uses it as the number of bytes to copy into a fixed-size buffer, without comparing it with the buffer size or the block length. A crafted Connect request causes an out-of-bounds write. This can lead to a crash (denial of service) or potentially arbitrary code execution. This option is disabled by default.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00404 34th percentileScored 2026-11-07

Fix Fixed P-Net (RT-Labs): 1.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
RT-Labs	P-Net	before 1.0.3	1.0.3	Patch available	CNA

P-Net VendorRT-Labs Affected before 1.0.3 Fixed in 1.0.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:rt-labs:p-net::::::::	—	—	RT-Labs

cpe:2.3:a:rt-labs:p-net:*:*:*:*:*:*:*:* Versions — — ·RT-Labs

Remediation

Update P-Net to version 1.0.3, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Fix · CNA P-Net (RT-Labs) Fixed in 1.0.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-29
RT-Labs P-Net 1.0.3
11 records Highest priority Priority MEDIUM 5 MEDIUM, 6 LOW
Other records, highest priority first
- TI-2026-82632 Resource exhaustion from RPC sessions kept for unknown interface requestsPriority MEDIUM 44
- TI-2026-82630 NULL pointer dereference in RT-Labs P-Net on implicit read requestsPriority MEDIUM 44
- TI-2026-82627 NULL pointer dereference in P-Net lets remote attackers crash devicesPriority MEDIUM 44
Show all 11 records →

Timeline

2026-10-29 Threatist record created from CVE-2026-111732
2026-10-29 Alias added: GHSA-h967-v272-9m8r
2026-11-05 CISA SSVC decision points changed

References

Other 1

Cybersecurity advisory for P-Net

TI-2026-82632 Resource exhaustion from RPC sessions kept for unknown interface requests CVSS 4.0HIGH 8.7
TI-2026-82630 NULL pointer dereference in RT-Labs P-Net on implicit read requests CVSS 4.0HIGH 8.7
TI-2026-82627 NULL pointer dereference in P-Net lets remote attackers crash devices CVSS 4.0HIGH 8.7
TI-2026-82625 Infinite loop in RT-Labs P-Net PDPortDataCheck record handling CVSS 4.0HIGH 8.7
TI-2025-23482 Out-of-bounds write in RT-Labs P-Net CVSS 3.1CRITICAL 9.8
TI-2025-23481 Out-of-bounds write in RT-Labs P-Net CVSS 3.1CRITICAL 9.8

See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences