High 7.1Published Oct 29, 2026

CVE-2026-111734Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()

Updated under an hour ago (Oct 30, 2026, 4:23 AM ET)

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It affects RT-Labs P-Net. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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P-Net before 1.0.3 does not validate the length of a received Ethernet frame in pf_eth_recv() before reading the EtherType, any VLAN tags and the PROFINET FrameID. The VLAN tag loop had no upper bound, so a truncated frame, or a frame consisting only of VLAN tags, makes the function read past the end of the receive buffer. This can cause a crash (denial of service) or disclose memory content.

CVSS: 7.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: rt-labs
NVD analysis: Deferred
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

RT-Labs P-Net rt_labs:p_net (from the name)	before 1.0.3	CNA record

References

References

https://rt-labs.com/wp-content/uploads/2026/10/RRTL-261019-01.pdf

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.