{"id":"CVE-2026-115793","kind":"vulnerability","aliases":["CVE-2026-115793"],"related":[],"title":"P-Net: unknown RPC requests exhaust sessions, device stops answering until restart","description":"P-Net before 1.0.3 does not release the RPC session allocated for an RPC request that names an unknown interface or object UUID, and does not start a timeout for it. Repeated requests with different activity UUIDs exhaust the available sessions. Once they are exhausted the device no longer answers new RPC requests, including Endpoint Mapper Lookup and Connect, until it is restarted. A remote unauthenticated attacker can use this to cause a denial of service.","summary":"P-Net, a PROFINET device stack, leaves the RPC session open when a request names an unknown interface or object UUID and never times it out. Repeated requests exhaust the sessions, so the device stops answering RPC requests until it is restarted, which is a remote denial of service.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","industrial-control","p-net","package","profinet"],"not_affected_if":["isolated-network","no-profinet","patched-p-net"],"how_to_check":"- Check whether the device firmware or library embeds P-Net, and which version: `unknown` if the sources do not say how to read it\n- Confirm whether the device is reachable from untrusted networks on the PROFINET RPC port (UDP 34964 is the usual PROFINET port, from general knowledge, not the sources)","fix":"- P-Net: move to `1.0.3` or later","status":"open","published_at":"2026-10-29T16:17:58+00:00","first_seen_at":"2026-10-29T16:25:56+00:00","triaged_at":"2026-10-29T16:29:21+00:00","updated_at":"2026-10-29T16:29:21+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-29T16:29:21Z","model":"claude-haiku-5-5","output":{"fix":"- P-Net: move to `1.0.3` or later","reach":"network","title":"P-Net: unknown RPC requests exhaust sessions, device stops answering until restart","impact":"medium","summary":"P-Net, a PROFINET device stack, leaves the RPC session open when a request names an unknown interface or object UUID and never times it out. Repeated requests exhaust the sessions, so the device stops answering RPC requests until it is restarted, which is a remote denial of service.","audience":"businesses","category":"package","nicknames":[],"who_cares":["profinet","p-net","embedded","industrial-control"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"device stops answering RPC requests until restarted","analyst_note":"Confirm which products ship P-Net and their fixed firmware versions at the NVD entry or vendor advisory.","how_to_check":"- Check whether the device firmware or library embeds P-Net, and which version: `unknown` if the sources do not say how to read it\n- Confirm whether the device is reachable from untrusted networks on the PROFINET RPC port (UDP 34964 is the usual PROFINET port, from general knowledge, not the sources)","plain_action":"","needs_analyst":true,"not_affected_if":["no-profinet","isolated-network","patched-p-net"],"who_is_affected":"Industrial or embedded devices that run P-Net before 1.0.3 and accept PROFINET RPC traffic from the network. Systems where PROFINET is kept on an isolated segment, or devices that do not use P-Net, can skip it. The sources do not name specific products.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000715,"input_tokens":4177,"output_tokens":595,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-115793':16A,19A '-2026':15A,18A '1.0.3':83C 'activ':115C 'alloc':90C 'answer':11A,65B,129C 'attack':146C 'avail':119C 'caus':151C 'connect':138C 'control':23B 'cve':14A,17A 'denial':76B,153C 'devic':9A,34B,63B,126C 'differ':114C 'embed':20B 'endpoint':134C 'exhaust':7A,58B,117C,124C 'includ':133C 'industri':22B 'industrial-control':21B 'interfac':47B,99C 'leav':36B 'longer':128C 'lookup':136C 'mapper':135C 'name':44B,96C 'net':3A,26B,31B,81C 'never':52B 'new':130C 'object':49B,101C 'open':40B 'p':2A,25B,30B,80C 'p-net':1A,24B,29B,79C 'packag':27B 'profinet':28B,33B 'releas':86C 'remot':75B,144C 'repeat':56B,111C 'request':6A,43B,57B,67B,94C,112C,132C 'restart':13A,71B,142C 'rpc':5A,38B,66B,88C,93C,131C 'servic':78B,155C 'session':8A,39B,60B,89C,120C 'stack':35B 'start':106C 'stop':10A,64B 'time':53B 'timeout':108C 'unauthent':145C 'unknown':4A,46B,98C 'use':148C 'uuid':50B,102C,116C","nicknames":[],"mitigations":[],"who_affected":"Industrial or embedded devices that run P-Net before 1.0.3 and accept PROFINET RPC traffic from the network. Systems where PROFINET is kept on an isolated segment, or devices that do not use P-Net, can skip it. The sources do not name specific products.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:17:58+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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-2026-115793","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115793","severity":null,"published_at":"2026-10-29T16:17:58+00:00","modified_at":"2026-10-29T16:17:58+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"}