{"id":"CVE-2026-112331","kind":"vulnerability","aliases":["CVE-2026-112331"],"related":[],"title":"Motor.NET: one crafted Kafka record crash-loops the consumer service","description":"Motor.NET before 0.19.0 contains a denial-of-service vulnerability that allows a remote attacker who can produce records to a consumed topic to crash the service permanently by sending a single crafted record. By setting the content-type header to application/cloudevents+json and omitting required CloudEvent attributes (id, source, type), the attacker triggers an ArgumentException in KafkaMessageConsumer.SingleMessageHandlingAsync that is treated as fatal, causing the host to stop and re-process the same poison record on every restart, resulting in a permanent crash-loop.","summary":"Motor.NET versions before 0.19.0 let anyone who can write to a consumed Kafka topic send one malformed CloudEvent record. The service treats the resulting exception as fatal and reprocesses the same record on every restart, so it stays down.","severity":"high","cvss":8.7,"epss":0.00679,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["dotnet","kafka","motor.net","package"],"not_affected_if":["not-using-motor-net","version-0.19.0-or-later"],"how_to_check":"Check the Motor.NET version in your .NET project's package references (for example, the csproj or packages.lock.json) and confirm whether it is below 0.19.0.","fix":"Upgrade Motor.NET to 0.19.0 or later.\nUntil then, restrict which principals can produce to the consumed topics.","status":"open","published_at":"2026-10-22T20:17:05+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","triaged_at":"2026-10-23T22:35:10+00:00","updated_at":"2026-10-24T07:15:51+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T22:35:10Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade Motor.NET to 0.19.0 or later.\nUntil then, restrict which principals can produce to the consumed topics.","reach":"network","title":"Motor.NET: one crafted Kafka record crash-loops the consumer service","impact":"medium","summary":"Motor.NET versions before 0.19.0 let anyone who can write to a consumed Kafka topic send one malformed CloudEvent record. The service treats the resulting exception as fatal and reprocesses the same record on every restart, so it stays down.","category":"package","who_cares":["dotnet","kafka","motor.net"],"confidence":0.7,"needs_auth":"unknown","worst_case":"Consumer service crash-loops permanently until the poison record is removed.","analyst_note":"Confirm the Kafka topic access an attacker needs and whether a dead-letter or offset-skip workaround exists; check the Motor.NET 0.19.0 release notes at the NVD entry's linked advisory.","how_to_check":"Check the Motor.NET version in your .NET project's package references (for example, the csproj or packages.lock.json) and confirm whether it is below 0.19.0.\nunknown","needs_analyst":true,"not_affected_if":["not-using-motor-net","version-0.19.0-or-later"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000539,"input_tokens":3005,"output_tokens":477,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-112331':14A,17A '-2026':13A,16A '0.19.0':25B,62C 'allow':71C 'anyon':27B 'application/cloudevents':102C 'argumentexcept':116C 'attack':74C,113C 'attribut':108C 'caus':124C 'cloudev':39B,107C 'consum':10A,33B,81C 'contain':63C 'content':98C 'content-typ':97C 'craft':3A,92C 'crash':7A,84C,145C 'crash-loop':6A,144C 'cve':12A,15A 'denial':66C 'denial-of-servic':65C 'dotnet':18B 'everi':55B,138C 'except':46B 'fatal':48B,123C 'header':100C 'host':126C 'id':109C 'json':103C 'kafka':4A,19B,34B 'kafkamessageconsumer.singlemessagehandlingasync':118C 'let':26B 'loop':8A,146C 'malform':38B 'motor.net':1A,20B,22B,60C 'omit':105C 'one':2A,37B 'packag':21B 'perman':87C,143C 'poison':135C 'process':132C 'produc':77C 're':131C 're-process':130C 'record':5A,40B,53B,78C,93C,136C 'remot':73C 'reprocess':50B 'requir':106C 'restart':56B,139C 'result':45B,140C 'send':36B,89C 'servic':11A,42B,68C,86C 'set':95C 'singl':91C 'sourc':110C 'stay':59B 'stop':128C 'topic':35B,82C 'treat':43B,121C 'trigger':114C 'type':99C,111C 'version':23B 'vulner':69C 'write':30B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T20:17:05+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112331","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112331","severity":null,"published_at":"2026-10-22T20:17:05+00:00","modified_at":"2026-10-23T17:06:36+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"epss","external_id":"CVE-2026-112331","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-112331","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-25T12:38:51+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"}