{"id":"CVE-2026-91970","kind":"vulnerability","aliases":["CVE-2026-91970","GHSA-wq92-8x3r-fm38","GO-2026-6757"],"related":[],"title":"Vikunja: Planka migration retains an unbounded aggregate of attacker-served attachments and can OOM the API in code.vikunja.io/api","description":"Vikunja: Planka migration retains an unbounded aggregate of attacker-served attachments and can OOM the API in code.vikunja.io/api.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: code.vikunja.io/api from v2.5.0 before v2.6.0.","summary":"The Vikunja API's Planka migration keeps an unbounded collection of attachments served by a remote source. An attacker who controls that source can exhaust the API's memory and crash it.","severity":"high","cvss":7.1,"epss":0.00378,"exploited":false,"exploited_at":null,"products":[{"name":"code.vikunja.io/api","fixed":[],"affected":"all versions","ecosystem":"go"}],"ecosystems":["go"],"tags":["go","package","planka-migration","self-hosted","vikunja"],"not_affected_if":["default-config","no-planka-migration"],"how_to_check":"Check go.mod for code.vikunja.io/api; versions from v2.5.0 before v2.6.0 are affected.","fix":"Upgrade code.vikunja.io/api to v2.6.0 or later.","status":"open","published_at":"2026-09-15T16:17:53+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","triaged_at":"2026-10-23T21:45:52+00:00","updated_at":"2026-10-23T21:45:52+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:45:52Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade code.vikunja.io/api to v2.6.0 or later.","reach":"unknown","impact":"medium","summary":"The Vikunja API's Planka migration keeps an unbounded collection of attachments served by a remote source. An attacker who controls that source can exhaust the API's memory and crash it.","category":"package","who_cares":["vikunja","go","self-hosted","planka-migration"],"confidence":0.6,"needs_auth":"unknown","worst_case":"API process exhausts memory and crashes, causing denial of service","analyst_note":"","how_to_check":"Check go.mod for code.vikunja.io/api; versions from v2.5.0 before v2.6.0 are affected.","needs_analyst":false,"not_affected_if":["default-config","no-planka-migration"],"user_interaction":"unknown","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000902,"input_tokens":2981,"output_tokens":1207,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':23A,31A,34A '-6757':32A '-91970':24A,35A '/api':21A,38A,148C '/api.':99C '8x3r':28A 'addit':108C,140C 'advisori':103C 'affect':141C 'aggreg':7A,85C 'api':17A,50B,74B,95C 'attach':12A,59B,90C 'attack':10A,66B,88C 'attacker-serv':9A,87C 'automat':114C 'caus':124C 'code.vikunja.io':20A,37A,98C,147C 'code.vikunja.io/api':19A,36A,146C 'code.vikunja.io/api.':97C 'collect':57B 'contain':107C 'control':68B 'could':111C 'crash':78B 'cve':22A,33A 'edit':135C 'exhaust':72B 'fals':126C 'false-posit':125C 'fm38':29A 'ghsa':26A 'ghsa-wq92-8x3r-fm38':25A 'go':30A,39B,118C 'host':46B 'keep':54B 'map':115C 'memori':76B 'migrat':3A,43B,53B,81C 'modul':119C,142C 'note':100C 'oom':15A,93C 'packag':40B 'planka':2A,42B,52B,80C 'planka-migr':41B 'pleas':132C 'posit':127C 'remot':63B 'report':106C,128C,138C 'retain':4A,82C 'scanner':131C 'self':45B 'self-host':44B 'serv':11A,60B,89C 'sourc':64B,70B,102C 'standard':117C 'suggest':133C 'unbound':6A,56B,84C 'v2.5.0':150C 'v2.6.0':152C 'version':109C,120C,144C 'vikunja':1A,47B,49B,79C 'vulner':130C 'wq92':27A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-09-15T16:17:53+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"govuln","external_id":"GO-2026-6757","url":"https://pkg.go.dev/vuln/GO-2026-6757","severity":null,"published_at":"2026-10-19T21:08:26+00:00","modified_at":"2026-10-19T21:08:26+00:00","first_seen_at":"2026-10-23T19:13:08+00:00","fetched_at":"2026-10-23T19:13:08+00:00","note":null},{"source":"epss","external_id":"CVE-2026-91970","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91970","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:43+00:00","fetched_at":"2026-10-23T19:13:43+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-91970","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91970","severity":null,"published_at":"2026-09-15T16:17:53+00:00","modified_at":"2026-09-16T19:49:18+00:00","first_seen_at":"2026-10-23T19:35:23+00:00","fetched_at":"2026-10-23T19:35:23+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"}