{"id":"CVE-2025-71461","kind":"vulnerability","aliases":["CVE-2025-71461"],"related":[],"title":"Zipline: predictable upload filenames let attackers guess private files","description":"Zipline before 4.0.2 contains a predictable filename vulnerability that allows attackers to infer other users' upload filenames by recovering the Math.random generator state. Attackers with five consecutive gfycat-style filenames can reconstruct the random state to predict previous and future filenames until the instance restarts, exposing private uploads.","summary":"Zipline before 4.0.2 generates upload filenames with Math.random, which can be reconstructed from five observed gfycat-style names. An attacker can then predict other users' upload filenames and reach private uploads until the instance restarts.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","zipline"],"not_affected_if":["public-uploads-only","single-user-instance"],"how_to_check":"- Check the Zipline version in use; affected if below `4.0.2`\n- Confirm whether the instance hosts private uploads for several users","fix":"- Upgrade Zipline to `4.0.2` or later","status":"open","published_at":"2026-11-13T10:17:24+00:00","first_seen_at":"2026-11-13T10:47:09+00:00","triaged_at":"2026-11-13T10:54:53+00:00","updated_at":"2026-11-13T10:54:53+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-13T10:54:53Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Zipline to `4.0.2` or later","reach":"internet","title":"Zipline: predictable upload filenames let attackers guess private files","impact":"medium","summary":"Zipline before 4.0.2 generates upload filenames with Math.random, which can be reconstructed from five observed gfycat-style names. An attacker can then predict other users' upload filenames and reach private uploads until the instance restarts.","audience":"businesses","category":"package","nicknames":[],"who_cares":["zipline","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"attacker reads other users' private uploads by predicting filenames","analyst_note":"","how_to_check":"- Check the Zipline version in use; affected if below `4.0.2`\n- Confirm whether the instance hosts private uploads for several users","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["single-user-instance","public-uploads-only"],"who_is_affected":"Teams that self-host Zipline as a file-sharing service where several users upload files that should stay private. An attacker who can see a few public upload URLs could guess others. Instances used by one person, or where uploads are not private, have less exposure.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000692,"input_tokens":4602,"output_tokens":463,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2025':11A,14A '-71461':12A,15A '4.0.2':23B,59C 'allow':66C 'attack':6A,41B,67C,80C 'consecut':83C 'contain':60C 'cve':10A,13A 'expos':103C 'file':9A 'filenam':4A,26B,48B,63C,73C,87C,98C 'five':34B,82C 'futur':97C 'generat':24B,78C 'gfycat':37B,85C 'gfycat-styl':36B,84C 'guess':7A 'host':19B 'infer':69C 'instanc':55B,101C 'let':5A 'math.random':28B,77C 'name':39B 'observ':35B 'packag':16B 'predict':2A,44B,62C,94C 'previous':95C 'privat':8A,51B,104C 'random':91C 'reach':50B 'reconstruct':32B,89C 'recov':75C 'restart':56B,102C 'self':18B 'self-host':17B 'state':79C,92C 'style':38B,86C 'upload':3A,25B,47B,52B,72C,105C 'user':46B,71C 'vulner':64C 'ziplin':1A,20B,21B,57C","nicknames":[],"mitigations":[],"who_affected":"Teams that self-host Zipline as a file-sharing service where several users upload files that should stay private. An attacker who can see a few public upload URLs could guess others. Instances used by one person, or where uploads are not private, have less exposure.","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":"'-2025':11A,14A '-71461':12A,15A 'attack':6A 'cve':10A,13A 'file':9A 'filenam':4A 'guess':7A 'let':5A 'predict':2A 'privat':8A 'upload':3A 'ziplin':1A","search_b":"'4.0.2':23B 'attack':41B 'filenam':26B,48B 'five':34B 'generat':24B 'gfycat':37B 'gfycat-styl':36B 'host':19B 'instanc':55B 'math.random':28B 'name':39B 'observ':35B 'packag':16B 'predict':44B 'privat':51B 'reach':50B 'reconstruct':32B 'restart':56B 'self':18B 'self-host':17B 'style':38B 'upload':25B,47B,52B 'user':46B 'ziplin':20B,21B","search_c":"'4.0.2':59C 'allow':66C 'attack':67C,80C 'consecut':83C 'contain':60C 'expos':103C 'filenam':63C,73C,87C,98C 'five':82C 'futur':97C 'generat':78C 'gfycat':85C 'gfycat-styl':84C 'infer':69C 'instanc':101C 'math.random':77C 'predict':62C,94C 'previous':95C 'privat':104C 'random':91C 'reconstruct':89C 'recov':75C 'restart':102C 'state':79C,92C 'style':86C 'upload':72C,105C 'user':71C 'vulner':64C 'ziplin':57C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2025-03-19T21:49:27+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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-2025-71461","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71461","severity":null,"published_at":"2026-11-13T10:17:24+00:00","modified_at":"2026-11-13T10:17:24+00:00","first_seen_at":"2026-11-13T10:47:09+00:00","fetched_at":"2026-11-13T10:47:09+00:00","note":null}],"documents":[{"id":144850,"url":"https://github.com/diced/zipline/security/advisories/GHSA-6rg9-q9ww-w2rw","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2025-03-19T21:49:27+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":144851,"url":"https://www.vulncheck.com/advisories/zipline-before-4.0.2-predictable-filenames-via-math-random-state-recovery","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"}