{"id":"CVE-2026-101569","kind":"vulnerability","aliases":["CVE-2026-101569"],"related":[],"title":"Helidon: concurrency-limits flaw allows unauthenticated data changes and partial denial of service","description":"Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-common-concurrency-limits).  Supported versions that are affected are 4.0.0-4.5.5 and 27.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).","summary":"Oracle's Helidon Java framework has a flaw in its concurrency-limits component that lets an unauthenticated remote attacker send HTTP requests that change or delete some data the service can access and partly disrupt the service. The attack needs no login and no user action, and the CVSS base score is 6.5 (medium).","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["helidon","java","oracle-fusion-middleware","runtime","self-hosted"],"not_affected_if":["not-helidon","outside-affected-versions"],"how_to_check":"- Check the Helidon version in the project's dependency file for `helidon-common-concurrency-limits` or the Helidon BOM; affected versions are `4.0.0` through `4.5.5` and `27.0.0`\n- Check whether the application uses the concurrency-limits feature (unknown whether it is on by default)","fix":"- Upgrade Helidon to a version that includes the Oracle fix (the patched version is unknown from the sources; check Oracle's Critical Patch Update advisory for the Helidon fixed release)\n- Rebuild and redeploy applications after updating the dependency","status":"open","published_at":"2026-10-20T22:18:09+00:00","first_seen_at":"2026-10-23T21:57:22+00:00","triaged_at":"2026-10-25T03:55:16+00:00","updated_at":"2026-10-25T03:55:16+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-25T03:55:16Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Helidon to a version that includes the Oracle fix (the patched version is unknown from the sources; check Oracle's Critical Patch Update advisory for the Helidon fixed release)\n- Rebuild and redeploy applications after updating the dependency","reach":"internet","title":"Helidon: concurrency-limits flaw allows unauthenticated data changes and partial denial of service","impact":"medium","summary":"Oracle's Helidon Java framework has a flaw in its concurrency-limits component that lets an unauthenticated remote attacker send HTTP requests that change or delete some data the service can access and partly disrupt the service. The attack needs no login and no user action, and the CVSS base score is 6.5 (medium).","category":"runtime","nicknames":[],"who_cares":["helidon","java","oracle-fusion-middleware","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Unauthenticated attacker modifies or deletes some data and partly disrupts service","analyst_note":"Find Oracle's Critical Patch Update advisory for this CVE to confirm the fixed Helidon version and whether the component is enabled by default.","how_to_check":"- Check the Helidon version in the project's dependency file for `helidon-common-concurrency-limits` or the Helidon BOM; affected versions are `4.0.0` through `4.5.5` and `27.0.0`\n- Check whether the application uses the concurrency-limits feature (unknown whether it is on by default)","needs_analyst":true,"not_affected_if":["not-helidon","outside-affected-versions"],"who_is_affected":"Applications built on the Helidon framework that include the helidon-common-concurrency-limits component and are reachable over HTTP from a network are exposed, as the sources list affected versions 4.0.0 through 4.5.5 and 27.0.0. Teams not running Helidon, or running versions outside the affected range, can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000702,"input_tokens":3497,"output_tokens":704,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-101569':17A,20A '-2026':16A,19A '/av':172C '27.0.0':110C '3.1':160C,171C '4.0.0':107C '4.5.5':108C '6.5':84B,163C 'abil':147C 'access':63B,119C,138C,143C 'action':77B 'affect':105C 'allow':6A,114C 'attack':50B,70B,116C,126C 'avail':166C 'base':81B,161C 'caus':149C 'chang':9A,55B 'common':98C 'compon':44B,95C 'compromis':123C 'concurr':3A,42B,99C 'concurrency-limit':2A,41B 'cve':15A,18A 'cvss':80B,159C,168C,170C 'data':8A,59B,144C 'delet':57B,137C 'denial':12A,152C 'disrupt':66B 'dos':156C 'easili':111C 'exploit':112C 'flaw':5A,38B 'framework':35B 'fusion':25B,93C 'helidon':1A,21B,33B,89C,97C,124C,142C,158C 'helidon-common-concurrency-limit':96C 'host':30B 'http':52B,121C 'impact':167C 'insert':135C 'integr':164C 'java':22B,34B 'l':180C 'l/a':179C 'l/pr':174C 'let':46B 'limit':4A,43B,100C 'login':73B 'medium':85B 'middlewar':26B,94C 'n/ac':173C 'n/i':178C 'n/s':176C 'n/ui':175C 'need':71B 'network':118C 'oracl':24B,31B,92C 'oracle-fusion-middlewar':23B 'part':65B 'partial':11A,151C,155C 'product':90C 'remot':49B 'request':53B 'result':131C 'runtim':27B 'score':82B,162C 'self':29B 'self-host':28B 'send':51B 'servic':14A,61B,68B,154C 'success':125C 'support':101C 'u/c':177C 'unauthent':7A,48B,115C 'unauthor':133C,146C 'updat':134C 'user':76B 'vector':169C 'version':102C 'via':120C 'vulner':86C,113C,129C","nicknames":[],"mitigations":[],"who_affected":"Applications built on the Helidon framework that include the helidon-common-concurrency-limits component and are reachable over HTTP from a network are exposed, as the sources list affected versions 4.0.0 through 4.5.5 and 27.0.0. Teams not running Helidon, or running versions outside the affected range, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:18:09+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-101569","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101569","severity":null,"published_at":"2026-10-20T22:18:09+00:00","modified_at":"2026-10-22T19:17:34+00:00","first_seen_at":"2026-10-23T21:57:22+00:00","fetched_at":"2026-10-23T22:28:58+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"}