{"id":"CVE-2026-109163","kind":"vulnerability","aliases":["CVE-2026-109163"],"related":[],"title":"Apache HTTP Server: stack buffer overflow in mod_vhost_alias module","description":"Stack-based buffer overflow vulnerability in Apache HTTP Server's mod_vhost_alias (after CVE-2026-63292)\n\n\n\nThis issue affects Apache HTTP Server: 2.4.69.","summary":"A stack-based buffer overflow in Apache HTTP Server's mod_vhost_alias module affects version 2.4.69. The sources do not state what an attacker can run or read after triggering it.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["apache-httpd","runtime","self-hosted"],"not_affected_if":[],"how_to_check":"- Run `httpd -v` or `apachectl -v` and look for `2.4.69`.\n- Check whether `mod_vhost_alias` is loaded with `httpd -M | grep vhost_alias`.","fix":null,"status":"open","published_at":"2026-11-11T15:17:14+00:00","first_seen_at":"2026-11-11T15:27:49+00:00","triaged_at":"2026-11-11T15:29:57+00:00","updated_at":"2026-11-11T15:29:57+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-11-11T15:29:57Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Apache HTTP Server: stack buffer overflow in mod_vhost_alias module","impact":"high","summary":"A stack-based buffer overflow in Apache HTTP Server's mod_vhost_alias module affects version 2.4.69. The sources do not state what an attacker can run or read after triggering it.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["apache-httpd","self-hosted"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown; a stack overflow may allow code execution","analyst_note":"Check the Apache security advisory for CVE-2026-109163 for trigger conditions, impact and fixed version; the NVD entry gives none.","how_to_check":"- Run `httpd -v` or `apachectl -v` and look for `2.4.69`.\n- Check whether `mod_vhost_alias` is loaded with `httpd -M | grep vhost_alias`.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Servers running Apache HTTP Server 2.4.69 with the mod_vhost_alias module loaded are the ones named in the description. The sources do not say what request or configuration reaches the overflow, so whether other setups are exposed is unknown.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000708,"input_tokens":4531,"output_tokens":510,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-109163':14A,17A '-2026':13A,16A,73C '-63292':74C '2.4.69':42B,81C 'affect':40B,77C 'alia':10A,38B,70C 'apach':1A,19B,32B,64C,78C 'apache-httpd':18B 'attack':50B 'base':28B,59C 'buffer':5A,29B,60C 'cve':12A,15A,72C 'host':24B 'http':2A,33B,65C,79C 'httpd':20B 'issu':76C 'mod':8A,36B,68C 'modul':11A,39B 'overflow':6A,30B,61C 'read':54B 'run':52B 'runtim':21B 'self':23B 'self-host':22B 'server':3A,34B,66C,80C 'sourc':44B 'stack':4A,27B,58C 'stack-bas':26B,57C 'state':47B 'trigger':56B 'version':41B 'vhost':9A,37B,69C 'vulner':62C","nicknames":[],"mitigations":[],"who_affected":"Servers running Apache HTTP Server 2.4.69 with the mod_vhost_alias module loaded are the ones named in the description. The sources do not say what request or configuration reaches the overflow, so whether other setups are exposed is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["apachehttpd","runtime","selfhosted","unknown"],"campaign_type":null,"search_a":"'-109163':14A,17A '-2026':13A,16A 'alia':10A 'apach':1A 'buffer':5A 'cve':12A,15A 'http':2A 'mod':8A 'modul':11A 'overflow':6A 'server':3A 'stack':4A 'vhost':9A","search_b":"'2.4.69':42B 'affect':40B 'alia':38B 'apach':19B,32B 'apache-httpd':18B 'attack':50B 'base':28B 'buffer':29B 'host':24B 'http':33B 'httpd':20B 'mod':36B 'modul':39B 'overflow':30B 'read':54B 'run':52B 'runtim':21B 'self':23B 'self-host':22B 'server':34B 'sourc':44B 'stack':27B 'stack-bas':26B 'state':47B 'trigger':56B 'version':41B 'vhost':37B","search_c":"'-2026':73C '-63292':74C '2.4.69':81C 'affect':77C 'alia':70C 'apach':64C,78C 'base':59C 'buffer':60C 'cve':72C 'http':65C,79C 'issu':76C 'mod':68C 'overflow':61C 'server':66C,80C 'stack':58C 'stack-bas':57C 'vhost':69C 'vulner':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T15:17:14+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109163","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109163","severity":null,"published_at":"2026-11-11T15:17:14+00:00","modified_at":"2026-11-11T15:17:14+00:00","first_seen_at":"2026-11-11T15:27:49+00:00","fetched_at":"2026-11-11T15:27:49+00:00","note":null}],"documents":[],"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"}