{"id":"CVE-2026-57915","kind":"vulnerability","aliases":["CVE-2026-57915","GHSA-262p-fj3f-xh7v"],"related":[],"title":"Apache Kerby has a bypass the Kerberos pre-authentication check","description":"It is possible to bypass the Kerberos pre-authentication check in Apache Kerby by sending a PA-DATA with an unrecognized or unsupported type. Users are recommended to upgrade to version 2.1.2, which fixes this issue.","summary":"Apache Kerby, a Java Kerberos library, can be made to skip its Kerberos pre-authentication check by sending a PA-DATA element with an unrecognized or unsupported type. An attacker who can reach the Kerberos server built on kerb-server can get past pre-authentication without valid credentials.","severity":"high","cvss":7.3,"epss":0.00526,"exploited":false,"exploited_at":null,"products":[{"name":"org.apache.kerby:kerb-server","fixed":["2.1.2"],"affected":"< 2.1.2","ecosystem":"maven"}],"ecosystems":["maven"],"tags":["apache-kerby","cwe-304","cwe-358","java","kerberos","maven","package"],"not_affected_if":["kerb-server-not-used","version-2.1.2-or-later"],"how_to_check":"- Run `mvn dependency:tree` and look for `org.apache.kerby:kerb-server`; a version below `2.1.2` is affected.\n- Check the lockfile or build output for `kerb-server` pinned to an older version.","fix":"- Apache Kerby (kerb-server): upgrade to `2.1.2`.","status":"open","published_at":"2026-06-26T13:16:35+00:00","first_seen_at":"2026-11-03T22:02:22+00:00","triaged_at":"2026-11-03T22:03:43+00:00","updated_at":"2026-11-03T22:07:19+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T22:03:43Z","model":"claude-haiku-5-5","output":{"fix":"- Apache Kerby (kerb-server): upgrade to `2.1.2`.","reach":"network","title":"Apache Kerby: unrecognized pre-auth data type bypasses Kerberos pre-authentication check","impact":"medium","summary":"Apache Kerby, a Java Kerberos library, can be made to skip its Kerberos pre-authentication check by sending a PA-DATA element with an unrecognized or unsupported type. An attacker who can reach the Kerberos server built on kerb-server can get past pre-authentication without valid credentials.","audience":"developers","category":"package","nicknames":[],"who_cares":["java","maven","kerberos","apache-kerby"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"pre-authentication bypassed on a Kerberos server","analyst_note":"Check the GHSA-262p-fj3f-xh7v advisory for the exact impact on authentication and whether default configurations are exposed.","how_to_check":"- Run `mvn dependency:tree` and look for `org.apache.kerby:kerb-server`; a version below `2.1.2` is affected.\n- Check the lockfile or build output for `kerb-server` pinned to an older version.","plain_action":"","needs_analyst":true,"not_affected_if":["kerb-server-not-used","version-2.1.2-or-later"],"who_is_affected":"Teams whose Java applications or services use the Apache Kerby kerb-server artifact below 2.1.2 to act as a Kerberos server or KDC. Applications that only use Kerberos clients or a different Kerberos implementation are not in the stated range. The sources do not say which default configurations are exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000729,"input_tokens":4186,"output_tokens":620,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,21A '-304':31B '-358':33B '-57915':14A,22A '2.1.2':123C '262p':17A 'apach':1A,28B,38B,102C 'apache-kerbi':27B 'attack':69B 'authent':10A,53B,86B,99C 'built':76B 'bypass':5A,94C 'check':11A,54B,100C 'credenti':89B 'cve':12A,20A 'cwe':30B,32B 'data':60B,109C 'element':61B 'fix':125C 'fj3f':18A 'get':82B 'ghsa':16A 'ghsa-262p-fj3f-xh7v':15A 'issu':127C 'java':34B,41B 'kerb':25A,79B 'kerb-serv':78B 'kerb-server':24A 'kerbero':7A,35B,42B,50B,74B,96C 'kerbi':2A,29B,39B,103C 'librari':43B 'made':46B 'maven':36B 'org.apache.kerby':23A 'pa':59B,108C 'pa-data':58B,107C 'packag':37B 'past':83B 'possibl':92C 'pre':9A,52B,85B,98C 'pre-authent':8A,51B,84B,97C 'reach':72B 'recommend':118C 'send':56B,105C 'server':26A,75B,80B 'skip':48B 'type':67B,115C 'unrecogn':64B,112C 'unsupport':66B,114C 'upgrad':120C 'user':116C 'valid':88B 'version':122C 'without':87B 'xh7v':19A","nicknames":[],"mitigations":[],"who_affected":"Teams whose Java applications or services use the Apache Kerby kerb-server artifact below 2.1.2 to act as a Kerberos server or KDC. Applications that only use Kerberos clients or a different Kerberos implementation are not in the stated range. The sources do not say which default configurations are exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":["orgapachekerbykerbserver"],"ptokens":["apache","kerb","kerby","org","server"],"labels":["apachekerby","cwe304","cwe358","high","java","kerberos","maven","package"],"campaign_type":null,"first_public_at":"2026-06-26T13:16:35+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cvss_by":"GitHub","poc_count":0,"sources":[{"source":"ghsa","external_id":"GHSA-262p-fj3f-xh7v","url":"https://github.com/advisories/GHSA-262p-fj3f-xh7v","severity":"high","published_at":"2026-06-26T15:32:13+00:00","modified_at":"2026-11-03T22:01:13+00:00","first_seen_at":"2026-11-03T22:02:22+00:00","fetched_at":"2026-11-03T22:07:23+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-57915","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57915","severity":null,"published_at":"2026-06-26T13:16:35+00:00","modified_at":"2026-10-25T22:10:00+00:00","first_seen_at":"2026-11-03T22:07:19+00:00","fetched_at":"2026-11-03T22:07:19+00:00","note":null}],"documents":[{"id":61019,"url":"https://github.com/apache/directory-kerby/commit/995fa59fac53f8e2e6fb987e0e29a5ae3a4bbf38","title":"Patch: github.com","kind":"other","source":"ghsa","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":61010,"url":"https://github.com/apache/directory-kerby/releases/tag/kerby-all-2.1.2","title":"Release: github.com","kind":"release","source":"ghsa","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release: github.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}