{"id":"CVE-2026-76290","kind":"vulnerability","aliases":["CVE-2026-76290"],"related":[],"title":"Splunk Enterprise: unauthenticated requests can exhaust resources and halt the daemon","description":"In Splunk Enterprise versions below 10.4.4, 10.2.8, and 10.0.11, an unauthenticated user could send repeated requests to the Edge Processor package download endpoint in the Splunk Pipeline Builders app. The requests could cause the Splunk daemon to consume excessive system resources and potentially stop responding.\nThe vulnerability is possible because the endpoint accepts package download requests without authentication and reads and base64-encodes the complete package in memory for each request.\nAfter upgrading, prepare all existing Edge Processor instances, turn on authentication for Edge Processor package downloads, and restart Splunk Enterprise. For more information, see Enable authentication for Edge Processor package downloads (https://help.splunk.com/en/data-management/process-data-at-the-edge/use-edge-processors-for-splunk-enterprise/10.4/administer-edge-processors/enable-authentication-for-edge-processor-package-downloads).","summary":"Splunk Enterprise's Edge Processor package download endpoint in the Pipeline Builders app accepts requests without authentication. Each request loads and base64-encodes the whole package in memory, so repeated requests can exhaust system resources and make the Splunk daemon stop responding.","severity":"high","cvss":7.5,"epss":0.00406,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["edge-processor","runtime","self-hosted","splunk","splunk-enterprise"],"not_affected_if":["fixed-version"],"how_to_check":"- Check the Splunk Enterprise version with `splunk version` and compare it against the fixed releases in the sources (10.4.4, 10.2.8, 10.0.11).\n- Confirm whether Edge Processor is in use on the instance, since the endpoint belongs to the Pipeline Builders app for Edge Processor packages.","fix":"- Upgrade Splunk Enterprise to `10.4.4`, `10.2.8`, or `10.0.11` depending on the release branch in use.\n- After upgrading, prepare all existing Edge Processor instances, turn on authentication for Edge Processor package downloads, and restart Splunk Enterprise, following the Splunk help page for enabling authentication for Edge Processor package downloads.","status":"open","published_at":"2026-10-21T23:17:26+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","triaged_at":"2026-10-25T03:16:22+00:00","updated_at":"2026-10-25T03:16:22+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-25T03:16:22Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Splunk Enterprise to `10.4.4`, `10.2.8`, or `10.0.11` depending on the release branch in use.\n- After upgrading, prepare all existing Edge Processor instances, turn on authentication for Edge Processor package downloads, and restart Splunk Enterprise, following the Splunk help page for enabling authentication for Edge Processor package downloads.","reach":"network","title":"Splunk Enterprise: unauthenticated requests can exhaust resources and halt the daemon","impact":"medium","summary":"Splunk Enterprise's Edge Processor package download endpoint in the Pipeline Builders app accepts requests without authentication. Each request loads and base64-encodes the whole package in memory, so repeated requests can exhaust system resources and make the Splunk daemon stop responding.","category":"runtime","nicknames":[],"who_cares":["splunk","splunk-enterprise","edge-processor","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Repeated requests make the Splunk daemon consume resources and stop responding.","analyst_note":"Confirm from the Splunk advisory whether the default configuration exposes the Edge Processor download endpoint and whether the Pipeline Builders app is installed by default.","how_to_check":"- Check the Splunk Enterprise version with `splunk version` and compare it against the fixed releases in the sources (10.4.4, 10.2.8, 10.0.11).\n- Confirm whether Edge Processor is in use on the instance, since the endpoint belongs to the Pipeline Builders app for Edge Processor packages.","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Deployments of Splunk Enterprise below the fixed versions that have the Splunk Pipeline Builders app with Edge Processor package downloads available are exposed. The sources describe an unauthenticated endpoint reachable by remote requests, so any reachable instance on those versions is in scope until patched or the authentication setting is enabled.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.00073,"input_tokens":3584,"output_tokens":743,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-76290':14A,17A '/en/data-management/process-data-at-the-edge/use-edge-processors-for-splunk-enterprise/10.4/administer-edge-processors/enable-authentication-for-edge-processor-package-downloads).':177C '10.0.11':80C '10.2.8':78C '10.4.4':77C 'accept':42B,124C 'app':41B,100C 'authent':45B,129C,154C,169C 'base64':51B,134C 'base64-encodes':50B,133C 'builder':40B,99C 'caus':104C 'complet':137C 'consum':109C 'could':84C,103C 'cve':12A,15A 'daemon':11A,69B,107C 'download':35B,93C,126C,159C,174C 'edg':19B,32B,90C,149C,156C,171C 'edge-processor':18B 'enabl':168C 'encod':52B,135C 'endpoint':36B,94C,123C 'enterpris':2A,28B,30B,74C,163C 'excess':110C 'exhaust':6A,62B 'exist':148C 'halt':9A 'help.splunk.com':176C 'help.splunk.com/en/data-management/process-data-at-the-edge/use-edge-processors-for-splunk-enterprise/10.4/administer-edge-processors/enable-authentication-for-edge-processor-package-downloads).':175C 'host':24B 'inform':166C 'instanc':151C 'load':48B 'make':66B 'memori':57B,140C 'packag':34B,55B,92C,125C,138C,158C,173C 'pipelin':39B,98C 'possibl':120C 'potenti':114C 'prepar':146C 'processor':20B,33B,91C,150C,157C,172C 'read':131C 'repeat':59B,86C 'request':4A,43B,47B,60B,87C,102C,127C,143C 'resourc':7A,64B,112C 'respond':71B,116C 'restart':161C 'runtim':21B 'see':167C 'self':23B 'self-host':22B 'send':85C 'splunk':1A,25B,27B,29B,68B,73C,97C,106C,162C 'splunk-enterpris':26B 'stop':70B,115C 'system':63B,111C 'turn':152C 'unauthent':3A,82C 'upgrad':145C 'user':83C 'version':75C 'vulner':118C 'whole':54B 'without':44B,128C","nicknames":[],"mitigations":[],"who_affected":"Deployments of Splunk Enterprise below the fixed versions that have the Splunk Pipeline Builders app with Edge Processor package downloads available are exposed. The sources describe an unauthenticated endpoint reachable by remote requests, so any reachable instance on those versions is in scope until patched or the authentication setting is enabled.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T23:17:26+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76290","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76290","severity":null,"published_at":"2026-10-21T23:17:26+00:00","modified_at":"2026-10-22T16:57:10+00:00","first_seen_at":"2026-10-23T21:57:29+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-76290","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-76290","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:54+00:00","fetched_at":"2026-10-24T13:15:54+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"}