{"id":"CVE-2026-126940","kind":"vulnerability","aliases":["CVE-2026-126940"],"related":[],"title":"Zipline: rate limit bypass lets attackers guess passwords faster","description":"Zipline before 4.6.4 contains a rate limit bypass vulnerability that allows remote attackers to evade request limits by varying query strings or supplying the x-zipline-p-filename header. Attackers can append differing query parameters to login and file or short-link password verification endpoints to perform credential guessing beyond the intended rate limits.","summary":"Zipline before 4.6.4 lets remote attackers evade login rate limits by varying query strings or sending an x-zipline-p-filename header. That allows unlimited password guessing against login and file or short-link password endpoints.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","zipline"],"not_affected_if":["managed-hosting","version-4.6.4-or-later"],"how_to_check":"- Check the installed Zipline version and see whether it is below `4.6.4`.\n- Confirm whether the instance is reachable from the internet, since the bypass is remote.","fix":"- Zipline: upgrade to `4.6.4` or later.","status":"open","published_at":"2026-11-13T10:18:00+00:00","first_seen_at":"2026-11-13T10:47:27+00:00","triaged_at":"2026-11-13T10:54:42+00:00","updated_at":"2026-11-13T10:54:42+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-13T10:54:42Z","model":"claude-haiku-5-5","output":{"fix":"- Zipline: upgrade to `4.6.4` or later.","reach":"internet","title":"Zipline: rate limit bypass lets attackers guess passwords faster","impact":"medium","summary":"Zipline before 4.6.4 lets remote attackers evade login rate limits by varying query strings or sending an x-zipline-p-filename header. That allows unlimited password guessing against login and file or short-link password endpoints.","audience":"businesses","category":"package","nicknames":[],"who_cares":["zipline","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"attacker guesses passwords without limits and gains access to protected files","analyst_note":"","how_to_check":"- Check the installed Zipline version and see whether it is below `4.6.4`.\n- Confirm whether the instance is reachable from the internet, since the bypass is remote.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["managed-hosting","version-4.6.4-or-later"],"who_is_affected":"Teams that self-host Zipline, the file and short-link sharing server, on an internet-reachable address and run versions before 4.6.4. The bypass targets rate limiting on login and password-protected file or short-link pages, so instances without password-protected content or with other access controls in front are lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00071,"input_tokens":4607,"output_tokens":498,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-126940':12A,15A '-2026':11A,14A '4.6.4':23B,61C 'allow':45B,69C 'append':91C 'attack':6A,26B,71C,89C 'beyond':110C 'bypass':4A,66C 'contain':62C 'credenti':108C 'cve':10A,13A 'differ':92C 'endpoint':58B,105C 'evad':27B,73C 'faster':9A 'file':52B,98C 'filenam':42B,87C 'guess':7A,48B,109C 'header':43B,88C 'host':19B 'intend':112C 'let':5A,24B 'limit':3A,30B,65C,75C,114C 'link':56B,102C 'login':28B,50B,96C 'p':41B,86C 'packag':16B 'paramet':94C 'password':8A,47B,57B,103C 'perform':107C 'queri':33B,78C,93C 'rate':2A,29B,64C,113C 'remot':25B,70C 'request':74C 'self':18B 'self-host':17B 'send':36B 'short':55B,101C 'short-link':54B,100C 'string':34B,79C 'suppli':81C 'unlimit':46B 'vari':32B,77C 'verif':104C 'vulner':67C 'x':39B,84C 'x-zipline-p-filenam':38B,83C 'ziplin':1A,20B,21B,40B,59C,85C","nicknames":[],"mitigations":[],"who_affected":"Teams that self-host Zipline, the file and short-link sharing server, on an internet-reachable address and run versions before 4.6.4. The bypass targets rate limiting on login and password-protected file or short-link pages, so instances without password-protected content or with other access controls in front are lower risk.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","package","selfhosted","zipline"],"campaign_type":null,"search_a":"'-126940':12A,15A '-2026':11A,14A 'attack':6A 'bypass':4A 'cve':10A,13A 'faster':9A 'guess':7A 'let':5A 'limit':3A 'password':8A 'rate':2A 'ziplin':1A","search_b":"'4.6.4':23B 'allow':45B 'attack':26B 'endpoint':58B 'evad':27B 'file':52B 'filenam':42B 'guess':48B 'header':43B 'host':19B 'let':24B 'limit':30B 'link':56B 'login':28B,50B 'p':41B 'packag':16B 'password':47B,57B 'queri':33B 'rate':29B 'remot':25B 'self':18B 'self-host':17B 'send':36B 'short':55B 'short-link':54B 'string':34B 'unlimit':46B 'vari':32B 'x':39B 'x-zipline-p-filenam':38B 'ziplin':20B,21B,40B","search_c":"'4.6.4':61C 'allow':69C 'append':91C 'attack':71C,89C 'beyond':110C 'bypass':66C 'contain':62C 'credenti':108C 'differ':92C 'endpoint':105C 'evad':73C 'file':98C 'filenam':87C 'guess':109C 'header':88C 'intend':112C 'limit':65C,75C,114C 'link':102C 'login':96C 'p':86C 'paramet':94C 'password':103C 'perform':107C 'queri':78C,93C 'rate':64C,113C 'remot':70C 'request':74C 'short':101C 'short-link':100C 'string':79C 'suppli':81C 'vari':77C 'verif':104C 'vulner':67C 'x':84C 'x-zipline-p-filenam':83C 'ziplin':59C,85C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-07-06T19:32:24+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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-2026-126940","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126940","severity":null,"published_at":"2026-11-13T10:18:00+00:00","modified_at":"2026-11-13T10:18:00+00:00","first_seen_at":"2026-11-13T10:47:27+00:00","fetched_at":"2026-11-13T10:47:27+00:00","note":null}],"documents":[{"id":145241,"url":"https://github.com/diced/zipline/security/advisories/GHSA-2qgq-hv52-jhqq","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-07-06T19:32:24+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":145242,"url":"https://www.vulncheck.com/advisories/zipline-before-4.6.4-rate-limit-bypass-via-query-string-and-header","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}