{"id":"CVE-2026-91332","kind":"vulnerability","aliases":["CVE-2026-91332"],"related":[],"title":"Java SE Networking: unauthenticated network flaw lets attackers alter some data","description":"Vulnerability in Oracle Java SE (component: Networking).  Supported versions that are affected are Oracle Java SE: 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1 and  21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Oracle Java SE 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 5.3 (Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).","summary":"A flaw in the Networking component of Oracle Java SE lets an unauthenticated attacker over the network change some data the Java application can access. The sources describe integrity impact only, with CVSS 5.3 and no confidentiality or availability loss.","severity":"medium","cvss":5.3,"epss":0.00282,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["graalvm","java","jvm","runtime","self-hosted"],"not_affected_if":["no-java","patched-release"],"how_to_check":"- Run `java -version` to see the installed Java SE release and compare it with the affected versions listed in the advisory.\n- Check whether GraalVM for JDK or GraalVM Enterprise Edition is in use, since those builds are also listed.","fix":"- Move Oracle Java SE to a patched release from Oracle's Critical Patch Update for the affected line: `8u503-perf` or later, `11.0.32.1` or later, `17.0.20.1` or later, `21.0.12.1` or later, `25.0.4.1` or later.\n- Move GraalVM for JDK to `17.0.20.1` or `21.0.12.1`, and GraalVM Enterprise Edition to `21.3.19.1.1` or later.","status":"open","published_at":"2026-10-20T22:20:35+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:22:50+00:00","updated_at":"2026-10-25T12:38:52+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-25T04:22:50Z","model":"claude-haiku-5-5","output":{"fix":"- Move Oracle Java SE to a patched release from Oracle's Critical Patch Update for the affected line: `8u503-perf` or later, `11.0.32.1` or later, `17.0.20.1` or later, `21.0.12.1` or later, `25.0.4.1` or later.\n- Move GraalVM for JDK to `17.0.20.1` or `21.0.12.1`, and GraalVM Enterprise Edition to `21.3.19.1.1` or later.","reach":"internet","title":"Java SE Networking: unauthenticated network flaw lets attackers alter some data","impact":"low","summary":"A flaw in the Networking component of Oracle Java SE lets an unauthenticated attacker over the network change some data the Java application can access. The sources describe integrity impact only, with CVSS 5.3 and no confidentiality or availability loss.","category":"runtime","nicknames":[],"who_cares":["java","jvm","graalvm","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker alters some data the Java application can access, over the network","analyst_note":"","how_to_check":"- Run `java -version` to see the installed Java SE release and compare it with the affected versions listed in the advisory.\n- Check whether GraalVM for JDK or GraalVM Enterprise Edition is in use, since those builds are also listed.","needs_analyst":false,"not_affected_if":["patched-release","no-java"],"who_is_affected":"Services that run an affected Java SE or GraalVM build and expose Networking APIs to untrusted network input, such as web services that pass request data into those APIs. Client machines running sandboxed Java Web Start applications or applets that load untrusted code are also named in the advisory. Teams that run only patched releases or non-Java stacks can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000694,"input_tokens":3656,"output_tokens":657,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-91332':14A,17A '/av':216C '11.0.32.1':84C '17.0.20.1':85C,93C '21.0.12.1':86C,95C '21.3.19.1.1':100C '25.0.4.1':87C '27':88C '3.1':206C,215C '5.3':58B,209C '8u503':82C '8u503-perf':81C 'access':49B,109C,131C,138C 'affect':76C 'allow':104C 'also':166C 'alter':9A 'api':148C,163C 'applet':183C 'appli':167C 'applic':47B,179C 'attack':8A,38B,106C,119C 'avail':63B 'base':207C 'chang':42B 'client':173C 'code':189C,191C 'come':193C 'compon':30B,70C,152C 'compromis':114C 'confidenti':61B 'cve':12A,15A 'cvss':57B,205C,212C,214C 'data':11A,44B,139C,160C 'delet':130C 'deploy':170C 'describ':52B 'e.g':153C,190C 'easili':101C 'edit':99C 'enterpris':98C 'exploit':102C,145C 'flaw':6A,26B 'graalvm':18B,90C,97C 'host':24B 'impact':54B,211C 'insert':128C 'integr':53B,210C 'internet':196C 'java':1A,19B,33B,46B,68C,79C,116C,136C,169C,176C,182C,201C 'jdk':92C 'jvm':20B 'l/a':223C 'l/pr':218C 'let':7A,35B 'load':185C 'loss':64B 'multipl':111C 'n':224C 'n/ac':217C 'n/i':222C 'n/s':220C 'n/ui':219C 'network':3A,5A,29B,41B,71C,108C 'note':140C 'oracl':32B,67C,78C,89C,96C,115C,135C 'perf':83C 'protocol':112C 'reli':198C 'result':124C 'run':174C,187C 'runtim':21B 'sandbox':175C,181C,202C 'score':208C 'se':2A,34B,69C,80C,117C,137C 'secur':204C 'self':23B 'self-host':22B 'servic':157C 'sourc':51B 'specifi':151C 'start':178C 'success':118C 'suppli':159C 'support':72C 'typic':171C 'u/c':221C 'unauthent':4A,37B,105C 'unauthor':126C 'untrust':188C 'updat':127C 'use':147C 'vector':213C 'version':73C 'via':110C 'vulner':65C,103C,122C,142C,165C 'web':156C,177C","nicknames":[],"mitigations":[],"who_affected":"Services that run an affected Java SE or GraalVM build and expose Networking APIs to untrusted network input, such as web services that pass request data into those APIs. Client machines running sandboxed Java Web Start applications or applets that load untrusted code are also named in the advisory. Teams that run only patched releases or non-Java stacks can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:35+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91332","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91332","severity":null,"published_at":"2026-10-20T22:20:35+00:00","modified_at":"2026-10-22T19:18:03+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","fetched_at":"2026-10-23T22:29:00+00:00","note":null},{"source":"epss","external_id":"CVE-2026-91332","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91332","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-25T12:38:52+00:00","fetched_at":"2026-10-25T12:38:52+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"}