{"id":"CVE-2026-80353","kind":"vulnerability","aliases":["CVE-2026-80353"],"related":[],"title":"Apache Tomcat: APR/Native connector socket race lets local users access socket","description":"Time-of-check time-of-use (TOCTOU) race condition vulnerability in Apache Tomcat when creating unix domain sockets for the APR/Native connector allows an unauthorised local user to access the unix domain socket. The fix for CVE-2026-65183 only addressed the NIO connector. It did not address the same issue in the APR/Native connector.\n\n\n\nThis issue affects Apache Tomcat: from 9.0.47 through 9.0.122.\n\n\n\nUsers are recommended to upgrade to version 9.0.123, which fixes the issue.","summary":"When Tomcat creates a Unix domain socket for the APR/Native connector, a race condition between the check and the creation step lets a local user access that socket. The fix for CVE-2026-65183 covered only the NIO connector, so the APR/Native connector remains exposed.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["java","linux","runtime","self-hosted","tomcat"],"not_affected_if":["multi-user-host-absent","nio-connector-only","no-apr-native","tomcat-10-or-11"],"how_to_check":"- Run `catalina.sh version` or check the Tomcat version in the server banner; affected range is `9.0.47` through `9.0.122`\n- Check whether the APR/Native connector is in use: look for `Connector` elements with `protocol=\"org.apache.coyote.http11.Http11AprProtocol\"` or the APR library loaded in `conf/server.xml`","fix":"- Upgrade Apache Tomcat 9 to `9.0.123`","status":"open","published_at":"2026-10-20T14:17:03+00:00","first_seen_at":"2026-10-23T21:57:20+00:00","triaged_at":"2026-10-25T05:04:47+00:00","updated_at":"2026-10-25T05:04:47+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-10-25T05:04:47Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Apache Tomcat 9 to `9.0.123`","reach":"local","title":"Apache Tomcat: APR/Native connector socket race lets local users access socket","impact":"low","summary":"When Tomcat creates a Unix domain socket for the APR/Native connector, a race condition between the check and the creation step lets a local user access that socket. The fix for CVE-2026-65183 covered only the NIO connector, so the APR/Native connector remains exposed.","category":"runtime","nicknames":[],"who_cares":["tomcat","java","self-hosted","linux"],"confidence":0.8,"needs_auth":"yes","worst_case":"A local user reads or accesses the Tomcat Unix domain socket","analyst_note":"","how_to_check":"- Run `catalina.sh version` or check the Tomcat version in the server banner; affected range is `9.0.47` through `9.0.122`\n- Check whether the APR/Native connector is in use: look for `Connector` elements with `protocol=\"org.apache.coyote.http11.Http11AprProtocol\"` or the APR library loaded in `conf/server.xml`","needs_analyst":false,"not_affected_if":["nio-connector-only","no-apr-native","tomcat-10-or-11","multi-user-host-absent"],"who_is_affected":"Teams running Apache Tomcat 9.0.47 through 9.0.122 with the APR/Native connector and Unix domain sockets on a host where untrusted local users have shell access. Exposure needs a local account on the machine; remote network attackers are not described as able to exploit it. Deployments on the NIO connector only, or on Tomcat 10 and 11, are outside the stated range.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.000649,"input_tokens":3397,"output_tokens":619,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A,57B,109C '-65183':58B,110C '-80353':14A,17A '9.0.122':135C '9.0.123':143C '9.0.47':133C 'access':10A,50B,100C 'address':112C,119C 'affect':129C 'allow':94C 'apach':1A,83C,130C 'apr/native':3A,34B,66B,92C,125C 'check':41B,73C 'condit':38B,80C 'connector':4A,35B,63B,67B,93C,115C,126C 'cover':59B 'creat':27B,86C 'creation':44B 'cve':12A,15A,56B,108C 'domain':30B,88C,103C 'expos':69B 'fix':54B,106C,145C 'host':23B 'issu':122C,128C,147C 'java':18B 'let':7A,46B 'linux':19B 'local':8A,48B,97C 'nio':62B,114C 'race':6A,37B,79C 'recommend':138C 'remain':68B 'runtim':20B 'self':22B 'self-host':21B 'socket':5A,11A,31B,52B,89C,104C 'step':45B 'time':71C,75C 'time-of-check':70C 'time-of-us':74C 'toctou':78C 'tomcat':2A,24B,26B,84C,131C 'unauthoris':96C 'unix':29B,87C,102C 'upgrad':140C 'use':77C 'user':9A,49B,98C,136C 'version':142C 'vulner':81C","nicknames":[],"mitigations":[],"who_affected":"Teams running Apache Tomcat 9.0.47 through 9.0.122 with the APR/Native connector and Unix domain sockets on a host where untrusted local users have shell access. Exposure needs a local account on the machine; remote network attackers are not described as able to exploit it. Deployments on the NIO connector only, or on Tomcat 10 and 11, are outside the stated range.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T14:17:03+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-80353","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80353","severity":null,"published_at":"2026-10-20T14:17:03+00:00","modified_at":"2026-10-20T19:35:38+00:00","first_seen_at":"2026-10-23T21:57:20+00:00","fetched_at":"2026-10-23T22:28:58+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"}