CVE-2026-111734 Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-111734?
CVE-2026-111734 is a high-severity vulnerability in RT-Labs P-Net, published on 29 Oct 2026.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-111734?
How do I fix CVE-2026-111734?
No fix has been published for CVE-2026-111734 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111734 being exploited?
There is no known exploitation of CVE-2026-111734 in the wild and no public exploit code.
Sources
Also known as GHSA-4h8m-mf3v-vw8j.