{"id":"CVE-2026-33969","kind":"vulnerability","aliases":["CVE-2026-33969"],"related":[],"title":"NAS Authentication Request decoding loops forever, causing denial of service","description":"In the NAS Authentication Request message decoding procedure, a missing lower bound check causes an infinite loop, leading to Denial of Service.","summary":"A missing lower bound check in the decoder for NAS Authentication Request messages (the cellular core signalling protocol) makes the procedure loop indefinitely. An attacker who can send such a message can stall the affected component and cause a denial of service.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cellular-core","nas-protocol","other"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-05T03:17:26+00:00","first_seen_at":"2026-11-05T03:31:43+00:00","triaged_at":"2026-11-05T03:33:52+00:00","updated_at":"2026-11-05T03:33:52+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-05T03:33:52Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"NAS Authentication Request decoding loops forever, causing denial of service","impact":"low","summary":"A missing lower bound check in the decoder for NAS Authentication Request messages (the cellular core signalling protocol) makes the procedure loop indefinitely. An attacker who can send such a message can stall the affected component and cause a denial of service.","audience":"businesses","category":"other","nicknames":[],"who_cares":["cellular-core","nas-protocol"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Decoder hangs, causing denial of service on the network component","analyst_note":"Identify the affected implementation and vendor from the NVD entry for CVE-2026-33969 and find its fixed versions.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000599,"input_tokens":4163,"output_tokens":365,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-33969':13A,16A 'affect':57B 'attack':47B 'authent':2A,33B,68C 'bound':26B,76C 'caus':7A,60B,78C 'cellular':18B,37B 'cellular-cor':17B 'check':27B,77C 'compon':58B 'core':19B,38B 'cve':11A,14A 'decod':4A,30B,71C 'denial':8A,62B,84C 'forev':6A 'indefinit':45B 'infinit':80C 'lead':82C 'loop':5A,44B,81C 'lower':25B,75C 'make':41B 'messag':35B,53B,70C 'miss':24B,74C 'nas':1A,21B,32B,67C 'nas-protocol':20B 'procedur':43B,72C 'protocol':22B,40B 'request':3A,34B,69C 'send':50B 'servic':10A,64B,86C 'signal':39B 'stall':55B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["cellularcore","nasprotocol","other","unknown"],"campaign_type":null,"first_public_at":"2026-11-05T03:17:26+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-33969","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33969","severity":null,"published_at":"2026-11-05T03:17:26+00:00","modified_at":"2026-11-05T03:17:26+00:00","first_seen_at":"2026-11-05T03:31:43+00:00","fetched_at":"2026-11-05T03:31:43+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}