{"id":"CVE-2026-111734","kind":"vulnerability","aliases":["CVE-2026-111734"],"related":[],"title":"P-Net: unchecked Ethernet frame length lets crafted packets crash or leak memory","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.","summary":"P-Net is an embedded PROFINET stack whose Ethernet receive routine reads past the end of the receive buffer when a frame is truncated or made only of VLAN tags. An attacker on the network can crash the device or read memory contents.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","industrial-control","p-net","profinet","runtime"],"not_affected_if":["p-net-1.0.3-or-later"],"how_to_check":"- Check the P-Net version in the device firmware or build configuration; versions before `1.0.3` are affected.","fix":"- Move to P-Net `1.0.3` or later.","status":"open","published_at":"2026-10-29T16:17:57+00:00","first_seen_at":"2026-10-29T16:25:56+00:00","triaged_at":"2026-10-29T16:30:03+00:00","updated_at":"2026-10-29T16:30:03+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-29T16:30:03Z","model":"claude-haiku-5-5","output":{"fix":"- Move to P-Net `1.0.3` or later.","reach":"network","title":"P-Net: unchecked Ethernet frame length lets crafted packets crash or leak memory","impact":"medium","summary":"P-Net is an embedded PROFINET stack whose Ethernet receive routine reads past the end of the receive buffer when a frame is truncated or made only of VLAN tags. An attacker on the network can crash the device or read memory contents.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["profinet","industrial-control","embedded","p-net"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"device crashes or leaks memory contents over the network","analyst_note":"Check the NVD entry and the P-Net project for which vendor products embed it and whether the sources name a PROFINET device family to inventory.","how_to_check":"- Check the P-Net version in the device firmware or build configuration; versions before `1.0.3` are affected.\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["p-net-1.0.3-or-later"],"who_is_affected":"Systems that embed P-Net, the PROFINET device stack used in industrial controllers and field devices, on a network an attacker can reach. Teams that do not ship or run P-Net-based PROFINET devices can skip it. The sources do not say which products bundle P-Net.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000681,"input_tokens":4173,"output_tokens":527,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-111734':17A,20A '-2026':16A,19A '1.0.3':78C 'attack':62B 'bound':111C 'buffer':49B,134C 'caus':137C 'consist':119C 'content':73B,146C 'control':24B 'craft':9A 'crash':11A,67B,139C 'cve':15A,18A 'denial':140C 'devic':69B 'disclos':144C 'embed':21B,35B 'end':45B,130C 'eth':91C 'ethernet':5A,39B,87C 'ethertyp':96C 'frame':6A,52B,88C,115C,118C 'frameid':103C 'function':126C 'industri':23B 'industrial-control':22B 'leak':13A 'length':7A,83C 'let':8A 'loop':107C 'made':56B 'make':124C 'memori':14A,72B,145C 'net':3A,27B,32B,76C 'network':65B 'p':2A,26B,31B,75C 'p-net':1A,25B,30B,74C 'packet':10A 'past':43B,128C 'pf':90C 'profinet':28B,36B,102C 'read':42B,71B,94C,127C 'receiv':40B,48B,86C,133C 'recv':92C 'routin':41B 'runtim':29B 'servic':142C 'stack':37B 'tag':60B,99C,106C,123C 'truncat':54B,114C 'uncheck':4A 'upper':110C 'valid':81C 'vlan':59B,98C,105C,122C 'whose':38B","nicknames":[],"mitigations":[],"who_affected":"Systems that embed P-Net, the PROFINET device stack used in industrial controllers and field devices, on a network an attacker can reach. Teams that do not ship or run P-Net-based PROFINET devices can skip it. The sources do not say which products bundle P-Net.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:17:57+00:00","kev":null,"cvss_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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"4b71179a-3b92-4a9d-b9fc-af8b8ed579ee","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111734","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111734","severity":null,"published_at":"2026-10-29T16:17:57+00:00","modified_at":"2026-10-29T16:17:57+00:00","first_seen_at":"2026-10-29T16:25:56+00:00","fetched_at":"2026-10-29T16:25:56+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}