CVE-2026-111732 PUBLISHED

Out-of-bounds write when parsing AR Vendor Block requests

Assigner: rt-labs
Reserved: 16.10.2026 Published: 29.10.2026 Updated: 29.10.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	RT-Labs
Product	P-Net
Versions	Default: unaffected affected from 0 to 1.0.3 (excl.)

Solutions

Upgrade to P-Net 1.0.3 or later.

Credits

f0rw4rd (quellsec.dev) finder

References

Cybersecurity advisory for P-Net

Problem Types

CWE-787 Out-of-bounds Write CWE