TI-2026-82629 Aliases CVE-2026-111735 GHSA-pmgf-c5w3-wm94

Integer underflow in P-Net leads to out-of-bounds read

LOW 30CWE-125Published 2026-10-29 · Updated 2026-11-05

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: Low · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

P-Net before 1.0.3 from RT-Labs contains an integer underflow in pf_cpm_c_data_ind(). When a cyclic data frame arrives while the consumer is in the FRUN or RUN state, the APDU status offset is computed as the frame length minus 4 without checking that the frame is long enough. A crafted short frame makes the offset wrap around, so the function reads outside the receive buffer. An adjacent attacker can trigger this by sending such a frame, which can crash the device or disclose memory contents.

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

Description from the CNA

P-Net before 1.0.3 contains an integer underflow in pf_cpm_c_data_ind(). When handling a received cyclic data frame while the consumer is in the FRUN or RUN state, the offset of the APDU status was computed as the frame length minus 4 using 16-bit arithmetic, without checking that the frame is long enough. A crafted short frame makes the offset wrap around, so the function reads outside the receive buffer. This can cause a crash (denial of service) or disclose memory content.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00165 5th 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: No
Technical impact: Partial

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 RT-Labs P-Net to version 1.0.3 or later. Version 1.0.3 is the only fixed version listed.

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-2026-82626 Out-of-bounds write when parsing AR Vendor Block requests in RT-Labs P-NetPriority MEDIUM 48
- 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
Show all 11 records →

Timeline

2026-10-29 Threatist record created from CVE-2026-111735
2026-10-29 Alias added: GHSA-pmgf-c5w3-wm94
2026-10-31 Priority changed: MEDIUM → LOW
2026-11-05 CISA SSVC decision points changed

References

Other 1

Cybersecurity advisory for P-Net

TI-2026-82626 Out-of-bounds write when parsing AR Vendor Block requests in RT-Labs P-Net CVSS 4.0CRITICAL 9.3
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

See all 28 →

Sources

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