{"id":"CVE-2026-88822","kind":"vulnerability","aliases":["CVE-2026-88822"],"related":[],"title":"OpenSSL: QUIC peer detection leaks uninitialized stack memory to network observers","description":"Issue summary: QUIC, when performing automated peer detection, may allow\nuninitialized stack data to leak into the received address which is then used\nas the destination for outgoing packets.\n\nImpact summary: Applications using QUIC's automated peer detection mechanism\nmay receive an invalid address, leading to connection loss and disclosure of\nuninitialized stack data to an attacker observing the outgoing network traffic.\n\nCWE: CWE-457 (Use of Uninitialized Variable)\n\nDescription: The OpenSSL QUIC stack contains a feature in which, when using an\nalready connected socket, it will auto-detect the peer address during the SSL\nhandshake.  This feature uses the getpeername() function, passing a buffer of\nsufficient length to hold any supported address family, but passes a buffer\nlength that is only sized such that larger addresses, such as IPv6, cannot be\nretrieved. The getpeername() function however, still returns the full address\nlength, which is accepted as the valid input buffer length, leading to the\naddress buffer containing uninitialized stack data instead of the actual peer\naddress. The invalid peer address is then used as destination for the outgoing\npackets which leads to a connectivity breakage and a leakage of the\nuninitialized stack data to passive network observers.\n\nFIPS impact: no\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE as\nthe affected protocol is not implemented in the FIPS module.","summary":"OpenSSL's QUIC stack can fill the peer address used for outgoing packets with uninitialized stack data when it auto-detects the peer on a connected socket. An attacker watching the network can read that stack data, and affected connections can break.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"OpenSSL","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["openssl","other","quic","servers"],"not_affected_if":["fips-module","no-quic","unconnected-sockets"],"how_to_check":"- Check whether the application uses OpenSSL's QUIC stack on a connected UDP socket, which is the path that runs automated peer detection during the handshake.","fix":null,"status":"open","published_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:21+00:00","triaged_at":"2026-11-10T20:04:53+00:00","updated_at":"2026-11-10T20:04:53+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-10T20:04:53Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"OpenSSL: QUIC peer detection leaks uninitialized stack memory to network observers","impact":"medium","summary":"OpenSSL's QUIC stack can fill the peer address used for outgoing packets with uninitialized stack data when it auto-detects the peer on a connected socket. An attacker watching the network can read that stack data, and affected connections can break.","audience":"businesses","category":"other","nicknames":[],"who_cares":["openssl","quic","servers"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Stack memory leaks to network observers and the connection breaks","analyst_note":"Find the fixed OpenSSL versions for each branch in the linked patch commits on github.com, since the sources give no version ranges.","how_to_check":"- Check whether the application uses OpenSSL's QUIC stack on a connected UDP socket, which is the path that runs automated peer detection during the handshake.\n- unknown for the affected OpenSSL version ranges; the sources do not list them.","plain_action":"","product_name":"OpenSSL","needs_analyst":true,"not_affected_if":["fips-module","no-quic","unconnected-sockets"],"who_is_affected":"Applications that use OpenSSL's QUIC implementation on an already connected socket, so that automated peer detection runs during the handshake. The sources say the FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected because the protocol is not implemented in them. Systems that do not use QUIC through OpenSSL can skip it.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.001473,"input_tokens":4964,"output_tokens":1953,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-457':130C '-88822':14A,17A '3.0':277C '3.4':275C '3.5':274C '3.6':273C '4.0':272C 'accept':212C 'actual':231C 'address':31B,84C,109C,158C,179C,193C,208C,222C,233C,237C 'affect':62B,280C,286C 'allow':75C 'alreadi':148C 'applic':97C 'attack':52B,122C 'auto':43B,154C 'auto-detect':42B,153C 'autom':71C,101C 'break':65B 'breakag':252C 'buffer':171C,184C,217C,223C 'cannot':197C 'connect':49B,63B,112C,149C,251C 'contain':140C,224C 'cve':12A,15A,283C 'cwe':128C,129C 'data':39B,60B,78C,119C,227C,260C 'descript':135C 'destin':91C,242C 'detect':4A,44B,73C,103C,155C 'disclosur':115C 'famili':180C 'featur':142C,164C 'fill':28B 'fip':265C,269C,293C 'full':207C 'function':168C,202C 'getpeernam':167C,201C 'handshak':162C 'hold':176C 'howev':203C 'impact':95C,266C 'implement':290C 'input':216C 'instead':228C 'invalid':108C,235C 'ipv6':196C 'issu':66C 'larger':192C 'lead':110C,219C,248C 'leak':5A,80C 'leakag':255C 'length':174C,185C,209C,218C 'loss':113C 'may':74C,105C 'mechan':104C 'memori':8A 'modul':270C,294C 'network':10A,55B,126C,263C 'observ':11A,123C,264C 'openssl':1A,18A,19B,23B,137C 'outgo':34B,93C,125C,245C 'packet':35B,94C,246C 'pass':169C,182C 'passiv':262C 'peer':3A,30B,46B,72C,102C,157C,232C,236C 'perform':70C 'protocol':287C 'quic':2A,21B,25B,68C,99C,138C 'read':57B 'receiv':83C,106C 'retriev':199C 'return':205C 'server':22B 'size':189C 'socket':50B,150C 'ssl':161C 'stack':7A,26B,38B,59B,77C,118C,139C,226C,259C 'still':204C 'suffici':173C 'summari':67C,96C 'support':178C 'traffic':127C 'uniniti':6A,37B,76C,117C,133C,225C,258C 'use':32B,88C,98C,131C,146C,165C,240C 'valid':215C 'variabl':134C 'watch':53B","nicknames":[],"mitigations":[],"who_affected":"Applications that use OpenSSL's QUIC implementation on an already connected socket, so that automated peer detection runs during the handshake. The sources say the FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected because the protocol is not implemented in them. Systems that do not use QUIC through OpenSSL can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["openssl"],"ptokens":["openssl"],"labels":["low","openssl","other","quic","servers","vendor"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88822':14A,17A 'cve':12A,15A 'detect':4A 'leak':5A 'memori':8A 'network':10A 'observ':11A 'openssl':1A,18A 'peer':3A 'quic':2A 'stack':7A 'uniniti':6A","search_b":"'address':31B 'affect':62B 'attack':52B 'auto':43B 'auto-detect':42B 'break':65B 'connect':49B,63B 'data':39B,60B 'detect':44B 'fill':28B 'network':55B 'openssl':19B,23B 'outgo':34B 'packet':35B 'peer':30B,46B 'quic':21B,25B 'read':57B 'server':22B 'socket':50B 'stack':26B,38B,59B 'uniniti':37B 'use':32B 'watch':53B","search_c":"'-457':130C '3.0':277C '3.4':275C '3.5':274C '3.6':273C '4.0':272C 'accept':212C 'actual':231C 'address':84C,109C,158C,179C,193C,208C,222C,233C,237C 'affect':280C,286C 'allow':75C 'alreadi':148C 'applic':97C 'attack':122C 'auto':154C 'auto-detect':153C 'autom':71C,101C 'breakag':252C 'buffer':171C,184C,217C,223C 'cannot':197C 'connect':112C,149C,251C 'contain':140C,224C 'cve':283C 'cwe':128C,129C 'data':78C,119C,227C,260C 'descript':135C 'destin':91C,242C 'detect':73C,103C,155C 'disclosur':115C 'famili':180C 'featur':142C,164C 'fip':265C,269C,293C 'full':207C 'function':168C,202C 'getpeernam':167C,201C 'handshak':162C 'hold':176C 'howev':203C 'impact':95C,266C 'implement':290C 'input':216C 'instead':228C 'invalid':108C,235C 'ipv6':196C 'issu':66C 'larger':192C 'lead':110C,219C,248C 'leak':80C 'leakag':255C 'length':174C,185C,209C,218C 'loss':113C 'may':74C,105C 'mechan':104C 'modul':270C,294C 'network':126C,263C 'observ':123C,264C 'openssl':137C 'outgo':93C,125C,245C 'packet':94C,246C 'pass':169C,182C 'passiv':262C 'peer':72C,102C,157C,232C,236C 'perform':70C 'protocol':287C 'quic':68C,99C,138C 'receiv':83C,106C 'retriev':199C 'return':205C 'size':189C 'socket':150C 'ssl':161C 'stack':77C,118C,139C,226C,259C 'still':204C 'suffici':173C 'summari':67C,96C 'support':178C 'traffic':127C 'uniniti':76C,117C,133C,225C,258C 'use':88C,98C,131C,146C,165C,240C 'valid':215C 'variabl':134C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:34+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-88822","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88822","severity":null,"published_at":"2026-11-10T19:21:34+00:00","modified_at":"2026-11-10T19:21:34+00:00","first_seen_at":"2026-11-10T19:25:21+00:00","fetched_at":"2026-11-10T19:25:21+00:00","note":null}],"documents":[{"id":117516,"url":"https://github.com/openssl/openssl/commit/1a73dc590cbad62d6f0329ea4779eadaa8d8fd75","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":117517,"url":"https://github.com/openssl/openssl/commit/7b4f5344aa0401e7b777640050b5257ed2a70e88","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":117518,"url":"https://github.com/openssl/openssl/commit/911eee8eb7550b95a206f1ad8cbdb986098982f3","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}