{"id":"MAL-2026-18271","kind":"package","aliases":["MAL-2026-18271"],"related":[],"title":"Malicious code in fontus (PyPI)","description":"---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: kam193 (2a8fcff0fd4d827c6f174318ee41ea82eb2667c6d65349a01ca2215aa2f4dd5e)\nThe package most likely performs fingerprinting by exfiltrating basic information and available fonts, with no other functionality.\n\n\n---\n\nCategory: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.\n\n\nCampaign: 2026-10-fontus\n\n\nReasons (based on the campaign):\n\n\n - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.","summary":null,"severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"fontus","fixed":[],"affected":"= 0.0.1; = 0.0.2; = 0.0.3","ecosystem":"pypi"}],"ecosystems":["pypi"],"tags":["malicious","package"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-25T10:58:27+00:00","first_seen_at":"2026-10-26T20:52:02+00:00","triaged_at":"2026-10-26T20:53:36+00:00","updated_at":"2026-10-26T21:05:48+00:00","category":"package","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'-10':75C '-18271':8A,11A '-2026':7A,10A '2026':74C '2a8fcff0fd4d827c6f174318ee41ea82eb2667c6d65349a01ca2215aa2f4dd5e':26C 'also':54C 'anyth':55C 'avail':38C 'base':78C 'basic':35C,88C 'campaign':73C,81C 'categori':44C 'clear':68C 'co':66C 'code':2A,85C 'contain':84C 'data':89C 'detail':17C 'edit':20C 'exfiltr':34C,87C 'explor':60C 'fingerprint':32C 'font':39C 'fontus':4A,12A,76C 'function':43C 'harm':71C 'inform':36C 'ip':94C 'kam193':25C 'kit':64C 'like':30C,49C,58C,93C 'limit':100C 'line':23C 'look':48C,57C 'low':70C 'low-harm':69C 'mal':6A,9A 'malici':1A,13B 'packag':14B,28C,47C,52C,83C 'pentest':46C,51C 'per':15C 'perform':31C 'possibl':72C 'pre':62C 'pre-prepar':61C 'prepar':63C 'probabl':45C 'pypi':5A 'reason':77C 'research':65C 'risk':101C 'sourc':16C,24C 'system':92C 'test':59C 'typic':50C 'usernam':96C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-25T10:58:27+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"osv-malicious","external_id":"MAL-2026-18271","url":"https://osv.dev/vulnerability/MAL-2026-18271","severity":"critical","published_at":"2026-10-25T10:58:27+00:00","modified_at":"2026-10-25T11:30:03+00:00","first_seen_at":"2026-10-26T20:52:02+00:00","fetched_at":"2026-10-26T20:52:02+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"}