{"id":"CVE-2026-123200","kind":"vulnerability","aliases":["CVE-2026-123200"],"related":[],"title":"VRPN: out-of-bounds stack write lets remote peers crash the process","description":"VRPN through 07.36 contains an out-of-bounds stack write vulnerability in vrpn_Endpoint::handle_sender_message() and handle_type_message() that allows unauthenticated remote peers to write outside a stack buffer via an unchecked length index. Attackers can connect, complete the version-cookie exchange, and send a SENDER_DESCRIPTION or TYPE_DESCRIPTION message with an out-of-range or negative index to crash the process.","summary":"VRPN, a library for networking virtual reality devices, has an out-of-bounds stack write in its sender and type message handlers. An unauthenticated remote peer can crash the process by sending a malformed description message with an out-of-range or negative index.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["c++","package","self-hosted","virtual-reality","vrpn"],"not_affected_if":["no-vrpn-in-use","not-network-exposed"],"how_to_check":"- Check whether any system runs VRPN at or before version `07.36`, the range the description names.\n- Look for VRPN servers or endpoints reachable from untrusted networks.","fix":"- A patch is linked from github.com; the sources do not state the fixed version.","status":"open","published_at":"2026-11-05T19:17:18+00:00","first_seen_at":"2026-11-05T19:40:35+00:00","triaged_at":"2026-11-05T19:42:49+00:00","updated_at":"2026-11-05T19:42:49+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-05T19:42:49Z","model":"claude-haiku-5-5","output":{"fix":"- A patch is linked from github.com; the sources do not state the fixed version.","reach":"network","title":"VRPN: out-of-bounds stack write lets remote peers crash the process","impact":"medium","summary":"VRPN, a library for networking virtual reality devices, has an out-of-bounds stack write in its sender and type message handlers. An unauthenticated remote peer can crash the process by sending a malformed description message with an out-of-range or negative index.","audience":"developers","category":"package","nicknames":[],"who_cares":["vrpn","c++","virtual-reality","self-hosted"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Remote crash of the VRPN process; the stack write may allow more, unconfirmed.","analyst_note":"Confirm the fixed VRPN version from the linked github.com patch and check whether the stack write allows more than a crash.","how_to_check":"- Check whether any system runs VRPN at or before version `07.36`, the range the description names.\n- Look for VRPN servers or endpoints reachable from untrusted networks.","plain_action":"","needs_analyst":true,"not_affected_if":["no-vrpn-in-use","not-network-exposed"],"who_is_affected":"Systems that run VRPN and accept connections from other peers, since the flaw is triggered by sending a crafted message after the version-cookie exchange. Systems that do not run VRPN, or that restrict who can connect to it, can skip this.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.001179,"input_tokens":4340,"output_tokens":1491,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123200':16A,19A '-2026':15A,18A '07.36':77C 'allow':98C 'attack':113C 'bound':5A,42B,83C 'buffer':107C 'c':20B 'complet':116C 'connect':115C 'contain':78C 'cooki':120C 'crash':11A,57B,141C 'cve':14A,17A 'descript':64B,126C,129C 'devic':36B 'endpoint':89C 'exchang':121C 'handl':90C,94C 'handler':51B 'host':24B 'index':74B,112C,139C 'length':111C 'let':8A 'librari':31B 'malform':63B 'messag':50B,65B,92C,96C,130C 'negat':73B,138C 'network':33B 'out-of-bound':2A,39B,80C 'out-of-rang':68B,133C 'outsid':104C 'packag':21B 'peer':10A,55B,101C 'process':13A,59B,143C 'rang':71B,136C 'realiti':27B,35B 'remot':9A,54B,100C 'self':23B 'self-host':22B 'send':61B,123C 'sender':47B,91C,125C 'stack':6A,43B,84C,106C 'type':49B,95C,128C 'unauthent':53B,99C 'uncheck':110C 'version':119C 'version-cooki':118C 'via':108C 'virtual':26B,34B 'virtual-r':25B 'vrpn':1A,28B,29B,75C,88C 'vulner':86C 'write':7A,44B,85C,103C","nicknames":[],"mitigations":[],"who_affected":"Systems that run VRPN and accept connections from other peers, since the flaw is triggered by sending a crafted message after the version-cookie exchange. Systems that do not run VRPN, or that restrict who can connect to it, can skip this.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["c","high","package","selfhosted","virtualreality","vrpn"],"campaign_type":null,"first_public_at":"2026-11-05T19:17:18+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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123200","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123200","severity":null,"published_at":"2026-11-05T19:17:18+00:00","modified_at":"2026-11-05T19:17:18+00:00","first_seen_at":"2026-11-05T19:40:35+00:00","fetched_at":"2026-11-05T19:40:35+00:00","note":null}],"documents":[{"id":79192,"url":"https://github.com/vrpn/vrpn/commit/0da5b0b71e06e8c318a4e674c84caee12251a782","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":79193,"url":"https://github.com/vrpn/vrpn/commit/c893b583d928fd17d756b39271b2eae71766e7f2","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":79194,"url":"https://www.vulncheck.com/advisories/vrpn-through-07.36-out-of-bounds-write-via-sender-description-type-description-length-index","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}