{"id":"CVE-2026-21850","kind":"vulnerability","aliases":["CVE-2026-21850"],"related":[],"title":"HCL AION: user input in HTTP headers allows header injection and response splitting","description":"HCL AION is affected by a vulnerability where user-controlled input could be included in HTTP response headers without proper neutralization of CR/LF characters. This may allow an attacker to inject headers or split responses, potentially resulting in unintended behavior or security impact under certain conditions.","summary":"HCL AION includes user-controlled input in HTTP response headers without stripping CR/LF characters. An attacker can inject extra headers or split the response, which can lead to unintended behavior under certain conditions.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["hcl-aion","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-06T14:17:11+00:00","first_seen_at":"2026-11-06T14:42:11+00:00","triaged_at":"2026-11-06T14:43:36+00:00","updated_at":"2026-11-06T14:43:36+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-06T14:43:36Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"HCL AION: user input in HTTP headers allows header injection and response splitting","impact":"medium","summary":"HCL AION includes user-controlled input in HTTP response headers without stripping CR/LF characters. An attacker can inject extra headers or split the response, which can lead to unintended behavior under certain conditions.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["hcl-aion"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker injects headers or splits HTTP responses, causing unintended behavior","analyst_note":"Find the affected HCL AION versions, the vulnerable endpoints and the vendor fix in the HCL advisory, which the NVD entry links to.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations that run HCL AION. The sources do not say which versions are affected, which endpoints take the input, or which configurations are exposed. unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000629,"input_tokens":4213,"output_tokens":415,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-21850':16A,19A 'affect':61C 'aion':2A,22B,25B,59C 'allow':8A,85C 'attack':40B,87C 'behavior':54B,98C 'certain':56B,103C 'charact':38B,82C 'condit':57B,104C 'control':29B,68C 'could':70C 'cr/lf':37B,81C 'cve':14A,17A 'extra':43B 'hcl':1A,21B,24B,58C 'hcl-aion':20B 'header':7A,9A,34B,44B,76C,90C 'http':6A,32B,74C 'impact':101C 'includ':26B,72C 'inject':10A,42B,89C 'input':4A,30B,69C 'lead':51B 'may':84C 'neutral':79C 'potenti':94C 'proper':78C 'respons':12A,33B,48B,75C,93C 'result':95C 'secur':100C 'split':13A,46B,92C 'strip':36B 'unintend':53B,97C 'user':3A,28B,67C 'user-control':27B,66C 'vendor':23B 'vulner':64C 'without':35B,77C","nicknames":[],"mitigations":[],"who_affected":"Organizations that run HCL AION. The sources do not say which versions are affected, which endpoints take the input, or which configurations are exposed. unknown","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["hclaion","medium","vendor"],"campaign_type":null,"search_a":"'-2026':15A,18A '-21850':16A,19A 'aion':2A 'allow':8A 'cve':14A,17A 'hcl':1A 'header':7A,9A 'http':6A 'inject':10A 'input':4A 'respons':12A 'split':13A 'user':3A","search_b":"'aion':22B,25B 'attack':40B 'behavior':54B 'certain':56B 'charact':38B 'condit':57B 'control':29B 'cr/lf':37B 'extra':43B 'hcl':21B,24B 'hcl-aion':20B 'header':34B,44B 'http':32B 'includ':26B 'inject':42B 'input':30B 'lead':51B 'respons':33B,48B 'split':46B 'strip':36B 'unintend':53B 'user':28B 'user-control':27B 'vendor':23B 'without':35B","search_c":"'affect':61C 'aion':59C 'allow':85C 'attack':87C 'behavior':98C 'certain':103C 'charact':82C 'condit':104C 'control':68C 'could':70C 'cr/lf':81C 'hcl':58C 'header':76C,90C 'http':74C 'impact':101C 'includ':72C 'inject':89C 'input':69C 'may':84C 'neutral':79C 'potenti':94C 'proper':78C 'respons':75C,93C 'result':95C 'secur':100C 'split':92C 'unintend':97C 'user':67C 'user-control':66C 'vulner':64C 'without':77C","first_public_at":"2026-11-06T14:17:11+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cvss_by":"psirt@hcl.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-21850","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21850","severity":null,"published_at":"2026-11-06T14:17:11+00:00","modified_at":"2026-11-06T14:17:11+00:00","first_seen_at":"2026-11-06T14:42:11+00:00","fetched_at":"2026-11-06T14:42:11+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}