{"id":"CVE-2026-24734","kind":"vulnerability","aliases":["CVE-2026-24734","GHSA-mgp5-rv84-w37q"],"related":[],"title":"Apache Tomcat has an Improper Input Validation vulnerability","description":"Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat.\n\nWhen using an OCSP responder, Tomcat Native (and Tomcat's FFM port of the Tomcat Native code) did not complete verification or freshness checks on the OCSP response which could allow certificate revocation to be bypassed.\n\nThis issue affects Apache Tomcat Native:  from 1.3.0 through 1.3.4, from 2.0.0 through 2.0.11; Apache Tomcat: from 11.0.0-M1 through 11.0.17, from 10.1.0-M7 through 10.1.51, from 9.0.83 through 9.0.114.\n\n\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39. Older EOL versions are not affected.\n\nApache Tomcat Native users are recommended to upgrade to versions 1.3.5 or later or 2.0.12 or later, which fix the issue.\n\nApache Tomcat users are recommended to upgrade to versions 11.0.18 or later, 10.1.52 or later or 9.0.115 or later which fix the issue.","summary":"Tomcat Native and Tomcat's FFM port did not fully verify or check the freshness of OCSP responses when an OCSP responder is used. An attacker may be able to get a revoked certificate accepted, bypassing revocation.","severity":"high","cvss":7.5,"epss":0.00575,"exploited":false,"exploited_at":null,"products":[{"name":"org.apache.tomcat:tomcat-coyote","fixed":["11.0.18"],"affected":">= 11.0.0-M1, < 11.0.18","ecosystem":"maven"},{"name":"org.apache.tomcat:tomcat-coyote","fixed":["10.1.52"],"affected":">= 10.1.0-M7, < 10.1.52","ecosystem":"maven"},{"name":"org.apache.tomcat:tomcat-coyote","fixed":["9.0.115"],"affected":">= 9.0.83, < 9.0.115","ecosystem":"maven"},{"name":"org.apache.tomcat.embed:tomcat-embed-core","fixed":["11.0.18"],"affected":">= 11.0.0-M1, < 11.0.18","ecosystem":"maven"},{"name":"org.apache.tomcat.embed:tomcat-embed-core","fixed":["10.1.52"],"affected":">= 10.1.0-M7, < 10.1.52","ecosystem":"maven"},{"name":"org.apache.tomcat.embed:tomcat-embed-core","fixed":["9.0.115"],"affected":">= 9.0.83, < 9.0.115","ecosystem":"maven"},{"name":"org.apache.tomcat:tomcat-coyote-ffm","fixed":["11.0.18"],"affected":">= 11.0.0-M1, < 11.0.18","ecosystem":"maven"},{"name":"org.apache.tomcat:tomcat-coyote-ffm","fixed":["10.1.52"],"affected":">= 10.1.0-M7, < 10.1.52","ecosystem":"maven"},{"name":"org.apache.tomcat:tomcat-coyote-ffm","fixed":["9.0.115"],"affected":">= 9.0.83, < 9.0.115","ecosystem":"maven"},{"name":"apache tomcat","fixed":["9.0.115"],"affected":">= 9.0.83, < 9.0.115","ecosystem":"vendor"},{"name":"apache tomcat","fixed":["10.1.52"],"affected":">= 10.1.1, < 10.1.52","ecosystem":"vendor"},{"name":"apache tomcat","fixed":["11.0.18"],"affected":">= 11.0.1, < 11.0.18","ecosystem":"vendor"},{"name":"apache tomcat","fixed":[],"affected":"= 10.1.0","ecosystem":"vendor"},{"name":"apache tomcat","fixed":[],"affected":"= 11.0.0","ecosystem":"vendor"},{"name":"apache tomcat native","fixed":["1.3.5"],"affected":">= 1.3.0, < 1.3.5","ecosystem":"vendor"},{"name":"apache tomcat native","fixed":["2.0.12"],"affected":">= 2.0.0, < 2.0.12","ecosystem":"vendor"}],"ecosystems":["maven","vendor"],"tags":["apache-tomcat","cwe-20","cwe-295","java","ocsp","package","tls"],"not_affected_if":["default-config","no-ocsp-checking"],"how_to_check":"- Check the Tomcat version in use, for example with `catalina.sh version` or the `tomcat-coyote` / `tomcat-embed-core` version in your Maven or Gradle dependency tree.\n- Check whether Tomcat Native is installed and which version, and whether OCSP checking is enabled in your TLS connector settings.","fix":"- Apache Tomcat 11.x: `11.0.18` or later\n- Apache Tomcat 10.1.x: `10.1.52` or later\n- Apache Tomcat 9.0.x: `9.0.115` or later\n- Apache Tomcat Native: `1.3.5` or later, or `2.0.12` or later","status":"open","published_at":"2026-02-17T19:21:56+00:00","first_seen_at":"2026-11-04T03:16:03+00:00","triaged_at":"2026-11-04T03:16:21+00:00","updated_at":"2026-11-04T03:46:40+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-04T03:16:21Z","model":"claude-haiku-5-5","output":{"fix":"- Apache Tomcat 11.x: `11.0.18` or later\n- Apache Tomcat 10.1.x: `10.1.52` or later\n- Apache Tomcat 9.0.x: `9.0.115` or later\n- Apache Tomcat Native: `1.3.5` or later, or `2.0.12` or later","reach":"network","title":"Apache Tomcat: OCSP checks skipped, so revoked certificates may be accepted","impact":"medium","summary":"Tomcat Native and Tomcat's FFM port did not fully verify or check the freshness of OCSP responses when an OCSP responder is used. An attacker may be able to get a revoked certificate accepted, bypassing revocation.","audience":"businesses","category":"package","nicknames":[],"who_cares":["apache-tomcat","java","tls","ocsp"],"confidence":0.8,"fix_status":"available","needs_auth":"unknown","worst_case":"revoked certificates accepted by TLS connections","analyst_note":"","how_to_check":"- Check the Tomcat version in use, for example with `catalina.sh version` or the `tomcat-coyote` / `tomcat-embed-core` version in your Maven or Gradle dependency tree.\n- Check whether Tomcat Native is installed and which version, and whether OCSP checking is enabled in your TLS connector settings.","plain_action":"","needs_analyst":false,"not_affected_if":["no-ocsp-checking","default-config"],"who_is_affected":"Only deployments that use OCSP revocation checking with Tomcat or Tomcat Native (including the FFM port) are exposed; the advisory lists affected Tomcat 9.0.83 through 9.0.114, 10.1.0-M7 through 10.1.51, and 11.0.0-M1 through 11.0.17, and Tomcat Native 1.3.0 through 1.3.4 and 2.0.0 through 2.0.11. Teams that do not use OCSP for client or server certificate checks can skip it, though the affected versions should still be upgraded.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000866,"input_tokens":4951,"output_tokens":741,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-20':82B '-2026':10A,18A '-24734':11A,19A '-295':84B '1.1.23':221C '1.1.34':223C '1.2.0':225C '1.2.39':227C '1.3.0':179C '1.3.4':181C '1.3.5':244C '10.1.0':194C '10.1.51':197C '10.1.52':267C '11.0.0':189C '11.0.17':192C '11.0.18':264C '2.0.0':183C '2.0.11':185C '2.0.12':248C '9.0.114':201C '9.0.115':271C '9.0.83':199C 'abl':117B 'accept':123B 'affect':174C,219C,233C 'allow':166C 'apach':1A,79B,131C,134C,175C,186C,234C,255C 'apache':62A,64A,66A,68A,70A,72A,75A 'apache-tomcat':78B 'attack':114B 'bypass':124B,171C 'certif':122B,167C 'check':101B,159C 'code':152C 'complet':155C 'core':36A,41A,46A 'could':165C 'coyote':23A,27A,31A,50A,55A,60A 'creat':213C 'cve':9A,17A,211C 'cwe':81B,83B 'embed':35A,40A,45A 'eol':206C,229C 'ffm':51A,56A,61A,94B,146C 'fix':252C,275C 'follow':203C 'fresh':103B,158C 'fulli':98B 'get':119B 'ghsa':13A 'ghsa-mgp5-rv84-w37q':12A 'improp':5A,126C 'input':6A,127C 'issu':173C,254C,277C 'java':85B 'known':216C 'later':246C,250C,266C,269C,273C 'm1':190C 'm7':195C 'may':115B 'mgp5':14A 'nativ':90B,133C,142C,151C,177C,236C 'native':74A,77A 'ocsp':86B,105B,109B,139C,162C 'older':228C 'org.apache.tomcat':20A,24A,28A,47A,52A,57A 'org.apache.tomcat.embed':32A,37A,42A 'packag':87B 'port':95B,147C 'recommend':239C,259C 'respond':110B,140C 'respons':106B,163C 'revoc':125B,168C 'revok':121B 'rv84':15A 'time':209C 'tls':88B 'tomcat':2A,22A,26A,30A,34A,39A,44A,49A,54A,59A,63A,65A,67A,69A,71A,73A,76A,80B,89B,92B,132C,135C,141C,144C,150C,176C,187C,235C,256C 'tomcat-coyote':21A,25A,29A 'tomcat-coyote-ffm':48A,53A,58A 'tomcat-embed-core':33A,38A,43A 'upgrad':241C,261C 'use':112B,137C 'user':237C,257C 'valid':7A,128C 'verif':156C 'verifi':99B 'version':204C,230C,243C,263C 'vulner':8A,129C 'w37q':16A","nicknames":[],"mitigations":[],"who_affected":"Only deployments that use OCSP revocation checking with Tomcat or Tomcat Native (including the FFM port) are exposed; the advisory lists affected Tomcat 9.0.83 through 9.0.114, 10.1.0-M7 through 10.1.51, and 11.0.0-M1 through 11.0.17, and Tomcat Native 1.3.0 through 1.3.4 and 2.0.0 through 2.0.11. Teams that do not use OCSP for client or server certificate checks can skip it, though the affected versions should still be upgraded.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["apachetomcat","apachetomcatnative","orgapachetomcatembedtomcatembedcore","orgapachetomcattomcatcoyote","orgapachetomcattomcatcoyoteffm","tomcat","tomcatnative"],"ptokens":["apache","core","coyote","embed","ffm","native","org","tomcat"],"labels":["apachetomcat","cwe20","cwe295","high","java","maven","ocsp","package","tls","vendor"],"campaign_type":null,"first_public_at":"2026-02-17T19:21:56+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cvss_by":"GitHub","poc_count":0,"sources":[{"source":"ghsa","external_id":"GHSA-mgp5-rv84-w37q","url":"https://github.com/advisories/GHSA-mgp5-rv84-w37q","severity":"high","published_at":"2026-02-17T21:31:13+00:00","modified_at":"2026-11-04T03:12:32+00:00","first_seen_at":"2026-11-04T03:16:03+00:00","fetched_at":"2026-11-04T03:16:03+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-24734","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24734","severity":null,"published_at":"2026-02-17T19:21:56+00:00","modified_at":"2026-07-15T14:17:21+00:00","first_seen_at":"2026-11-04T03:46:40+00:00","fetched_at":"2026-11-04T03:46:40+00:00","note":null}],"documents":[{"id":63421,"url":"https://github.com/apache/tomcat/commit/e76e9eaa246f30debd603726d9147a8a8cb5171c","title":"Patch: github.com","kind":"other","source":"ghsa","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":63830,"url":"https://lists.apache.org/thread/292dlmx3fz1888v6v16221kpozq56gml","title":"Vendor advisory: lists.apache.org","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Vendor advisory: lists.apache.org"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}