{"id":"CVE-2026-114820","kind":"vulnerability","aliases":["CVE-2026-114820"],"related":[],"title":"Oracle Java SE JSSE: unauthenticated network attacker gains full data access","description":"Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE).  Supported versions that are affected are Oracle Java SE: 8u511-b32, 8u511-perf-b32, 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, 27.0.1.0.2; Oracle GraalVM for JDK: 17.0.21.0.2 and  21.0.13.0.2; Oracle GraalVM Enterprise Edition: 21.3.20.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as  unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).","summary":"A flaw in the JSSE component of Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition lets an unauthenticated attacker over the network create, modify, delete or read data handled by the JDK. A public proof-of-concept scanner exists on GitHub.","severity":"critical","cvss":9.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["graalvm","java","jdk","oracle","poc-public","runtime","self-hosted","web-services"],"not_affected_if":["patched-jdk-build"],"how_to_check":"- Run `java -version` and compare against the affected releases: 8u511, 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, 27.0.1.0.2.\n- Check GraalVM builds with `native-image --version` or the GraalVM release string against 17.0.21.0.2, 21.0.13.0.2 and 21.3.20.0.2.\n- Find bundled JDKs in application images and servers, not only the system JDK.","fix":"- Move Oracle Java SE to the Oracle Critical Patch Update release that fixes this CVE; the sources do not name the fixed build.\n- Move GraalVM for JDK or GraalVM Enterprise to the patched release from Oracle's advisory.\n- Rebuild and redeploy container images that embed a JDK.","status":"open","published_at":"2026-10-24T19:17:04+00:00","first_seen_at":"2026-10-24T19:23:38+00:00","triaged_at":"2026-10-25T02:59:49+00:00","updated_at":"2026-10-25T02:59:49+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-25T02:59:49Z","model":"claude-haiku-5-5","output":{"fix":"- Move Oracle Java SE to the Oracle Critical Patch Update release that fixes this CVE; the sources do not name the fixed build.\n- Move GraalVM for JDK or GraalVM Enterprise to the patched release from Oracle's advisory.\n- Rebuild and redeploy container images that embed a JDK.","reach":"internet","title":"Oracle Java SE JSSE: unauthenticated network attacker gains full data access","impact":"high","summary":"A flaw in the JSSE component of Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition lets an unauthenticated attacker over the network create, modify, delete or read data handled by the JDK. A public proof-of-concept scanner exists on GitHub.","category":"runtime","nicknames":[],"who_cares":["java","jdk","graalvm","oracle","web-services","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated attacker creates, modifies or reads all data the JDK can access","analyst_note":"Confirm the fixed build numbers and how_to_check details from Oracle's July 2026 CPU advisory and the github-poc repository; the NVD entry does not give them.","how_to_check":"- Run `java -version` and compare against the affected releases: 8u511, 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, 27.0.1.0.2.\n- Check GraalVM builds with `native-image --version` or the GraalVM release string against 17.0.21.0.2, 21.0.13.0.2 and 21.3.20.0.2.\n- Find bundled JDKs in application images and servers, not only the system JDK.","needs_analyst":true,"not_affected_if":["patched-jdk-build"],"who_is_affected":"Any service running an affected JDK that accepts network input processed through JSSE (TLS and related APIs) is exposed, for example a web service that passes data to those APIs. The sources also say Java applets and Web Start applications running untrusted code are affected. Systems on unaffected JDK builds can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000784,"input_tokens":3958,"output_tokens":777,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-114820':14A,17A '-2026':13A,16A '/av':291C '11.0.33.0.2':113C '17.0.21.0.2':114C,122C '21.0.13.0.2':115C,124C '21.3.20.0.2':129C '25.0.5.0.2':116C '27.0.1.0.2':117C '3.1':279C,290C '8u511':107C,110C '8u511-b32':106C '8u511-perf-b32':109C '9.1':282C 'access':11A,138C,168C,185C,191C,197C,211C 'affect':101C 'allow':133C 'also':239C 'api':221C,236C 'applet':256C 'appli':240C 'applic':252C 'attack':7A,52B,135C,156C 'b32':108C,112C 'base':280C 'client':246C 'code':262C,264C 'come':266C 'complet':196C 'compon':37B,95C,225C 'compromis':143C 'concept':71B 'confidenti':283C 'creat':56B 'creation':164C 'critic':170C,193C 'cve':12A,15A 'cvss':278C,287C,289C 'data':10A,61B,171C,186C,194C,212C,233C 'delet':58B,165C 'deploy':243C 'e.g':226C,263C 'easili':130C 'edit':48B,89C,128C,154C,184C,210C 'enterpris':47B,88C,127C,153C,183C,209C 'exist':73B 'exploit':131C,218C 'flaw':33B 'full':9A 'gain':8A 'github':75B 'graalvm':18B,42B,46B,83C,87C,119C,126C,148C,152C,178C,182C,204C,208C 'h/a':298C 'h/i':297C 'handl':62B 'host':28B 'impact':286C 'integr':285C 'internet':269C 'java':2A,19B,40B,80C,93C,104C,145C,175C,201C,242C,249C,255C,274C 'jdk':20B,44B,65B,85C,121C,150C,180C,206C 'jsse':4A,36B,96C 'l/pr':293C 'let':49B 'load':258C 'modif':167C 'modifi':57B 'multipl':140C 'n':299C 'n/ac':292C 'n/s':295C 'n/ui':294C 'network':6A,55B,137C 'note':213C 'oracl':1A,21B,39B,79C,82C,86C,92C,103C,118C,125C,144C,147C,151C,174C,177C,181C,200C,203C,207C 'perf':111C 'poc':23B 'poc-publ':22B 'product':90C 'proof':69B 'proof-of-concept':68B 'protocol':141C 'public':24B,67B 'read':60B 'reli':271C 'result':161C 'run':247C,260C 'runtim':25B 'sandbox':248C,254C,275C 'scanner':72B 'score':281C 'se':3A,41B,81C,94C,105C,146C,176C,202C 'secur':277C 'self':27B 'self-host':26B 'servic':31B,230C 'specifi':224C 'start':251C 'success':155C 'suppli':232C 'support':97C 'typic':244C 'u/c':296C 'unauthent':5A,51B,134C 'unauthor':163C,190C 'untrust':261C 'use':220C 'vector':288C 'version':98C 'via':139C 'vulner':76C,132C,159C,215C,238C 'web':30B,229C,250C 'web-servic':29B 'well':188C","nicknames":[],"mitigations":[],"who_affected":"Any service running an affected JDK that accepts network input processed through JSSE (TLS and related APIs) is exposed, for example a web service that passes data to those APIs. The sources also say Java applets and Web Start applications running untrusted code are affected. Systems on unaffected JDK builds can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-24T19:17:04+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvss_by":"secalert_us@oracle.com","poc_count":1,"sources":[{"source":"nvd","external_id":"CVE-2026-114820","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114820","severity":null,"published_at":"2026-10-24T19:17:04+00:00","modified_at":"2026-10-24T19:17:04+00:00","first_seen_at":"2026-10-24T19:23:38+00:00","fetched_at":"2026-10-24T19:23:38+00:00","note":null},{"source":"github-poc","external_id":"joedayz/cve-2026-114820-java-scan","url":"https://github.com/joedayz/cve-2026-114820-java-scan","severity":null,"published_at":"2026-10-24T19:33:38+00:00","modified_at":null,"first_seen_at":"2026-10-24T19:38:53+00:00","fetched_at":"2026-10-24T19:38:53+00:00","note":null}],"documents":[{"id":2953,"url":"https://github.com/joedayz/cve-2026-114820-java-scan","title":"joedayz/cve-2026-114820-java-scan","kind":"poc","source":"github","text":"Read-only Ansible playbook that finds Java truststores still anchoring the eMudhra and AAA roots removed for CVE-2026-114820.\n\nstars 0","published_at":"2026-10-24T19:33:38+00:00","relation":"poc","confidence":null,"note":"0 stars"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}