CVE-2026-111735

Integer underflow leads to out-of-bounds read in pf_cpm_c_data_ind()

Published Oct 29, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Upgrade to P-Net 1.0.3 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Rt-labs
Rt-labs p-net
Vendors & Products Rt-labs
Rt-labs p-net
Type Values Removed Values Added
Description 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.
Title Integer underflow leads to out-of-bounds read in pf_cpm_c_data_ind()
Weaknesses CWE-125
CWE-191
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
rt-labs
Published
Updated
Nov 5, 2026, 9:23 PM
Reserved
Oct 16, 2026, 3:50 PM
Status
Deferred
Published
Oct 29, 2026, 4:17 PM
Modified
Nov 5, 2026, 10:17 PM