{"id":"CVE-2026-114426","kind":"vulnerability","aliases":["CVE-2026-114426"],"related":[],"title":"SEPPmail Secure Email Gateway: unauthenticated upload flaw lets attackers exhaust resources","description":"SEPPmail Secure Email Gateway before 15.1.1 processes and writes v1 file-interface upload data before authenticating the caller and without an absolute request-size limit. An unauthenticated remote attacker can occupy workers and consume temporary storage with concurrent or slow requests, causing service unavailability.","summary":"SEPPmail Secure Email Gateway before 15.1.1 processes and writes v1 file-interface upload data before checking the caller's identity, and it has no absolute request-size limit. An unauthenticated remote attacker can tie up workers and fill temporary storage with concurrent or slow requests, making the service unavailable.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["email-gateway","infrastructure","self-hosted","seppmail"],"not_affected_if":["version-15.1.1-or-later"],"how_to_check":"- Check the installed SEPPmail version against the fixed release `15.1.1`\n- Confirm whether the v1 file-interface upload endpoint is reachable from the internet","fix":"- SEPPmail Secure Email Gateway: upgrade to `15.1.1` or later","status":"open","published_at":"2026-11-04T09:17:41+00:00","first_seen_at":"2026-11-04T09:26:09+00:00","triaged_at":"2026-11-04T09:26:47+00:00","updated_at":"2026-11-04T09:26:47+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-11-04T09:26:47Z","model":"claude-haiku-5-5","output":{"fix":"- SEPPmail Secure Email Gateway: upgrade to `15.1.1` or later","reach":"internet","title":"SEPPmail Secure Email Gateway: unauthenticated upload flaw lets attackers exhaust resources","impact":"medium","summary":"SEPPmail Secure Email Gateway before 15.1.1 processes and writes v1 file-interface upload data before checking the caller's identity, and it has no absolute request-size limit. An unauthenticated remote attacker can tie up workers and fill temporary storage with concurrent or slow requests, making the service unavailable.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["seppmail","email-gateway","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Service becomes unavailable through resource exhaustion by unauthenticated requests","analyst_note":"Confirm whether the v1 file-interface is enabled by default and check the vendor advisory for mitigations before upgrade is possible.","how_to_check":"- Check the installed SEPPmail version against the fixed release `15.1.1`\n- Confirm whether the v1 file-interface upload endpoint is reachable from the internet\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["version-15.1.1-or-later"],"who_is_affected":"Organisations running SEPPmail Secure Email Gateway releases before 15.1.1 with the v1 file-interface upload path reachable by remote callers. The sources do not say whether the flaw depends on specific configuration beyond the affected version.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000713,"input_tokens":4134,"output_tokens":599,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-114426':14A,17A '-2026':13A,16A '15.1.1':31B,82C 'absolut':51B,99C 'attack':9A,59B,107C 'authent':93C 'caller':44B,95C 'caus':120C 'check':42B 'concurr':69B,116C 'consum':112C 'cve':12A,15A 'data':40B,91C 'email':3A,19B,28B,79C 'email-gateway':18B 'exhaust':10A 'file':37B,88C 'file-interfac':36B,87C 'fill':65B 'flaw':7A 'gateway':4A,20B,29B,80C 'host':24B 'ident':46B 'infrastructur':21B 'interfac':38B,89C 'let':8A 'limit':55B,103C 'make':73B 'occupi':109C 'process':32B,83C 'remot':58B,106C 'request':53B,72B,101C,119C 'request-s':52B,100C 'resourc':11A 'secur':2A,27B,78C 'self':23B 'self-host':22B 'seppmail':1A,25B,26B,77C 'servic':75B,121C 'size':54B,102C 'slow':71B,118C 'storag':67B,114C 'temporari':66B,113C 'tie':61B 'unauthent':5A,57B,105C 'unavail':76B,122C 'upload':6A,39B,90C 'v1':35B,86C 'without':97C 'worker':63B,110C 'write':34B,85C","nicknames":[],"mitigations":[],"who_affected":"Organisations running SEPPmail Secure Email Gateway releases before 15.1.1 with the v1 file-interface upload path reachable by remote callers. The sources do not say whether the flaw depends on specific configuration beyond the affected version.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["emailgateway","high","infrastructure","selfhosted","seppmail"],"campaign_type":null,"first_public_at":"2026-11-04T09:17:41+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":"vulnerability@ncsc.ch","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-114426","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114426","severity":null,"published_at":"2026-11-04T09:17:41+00:00","modified_at":"2026-11-04T09:17:41+00:00","first_seen_at":"2026-11-04T09:26:09+00:00","fetched_at":"2026-11-04T09:26:09+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"}