High severity · published Oct 29, 2026
CVE-2026-111734
Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()
New
7.1
CVSS
–
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PN
P-Net · RT-Labs
before 1.0.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111734
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111734
rt-labs.com
https://rt-labs.com/wp-content/uploads/2026/10/RRTL-261019-01.pdf
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