{"id":"INC-gitbook-01KK219E7DFDQZ9TYYQ7BGMFGA","kind":"incident","aliases":[],"related":[],"title":"GitBook: Documentation sites with a custom domain returned a 404 error","description":"Between 14:36 and 14:43 UTC, all GitBook documentation sites using a custom domain were returning a 404 \"Not Found\" error, making documentation unavailable to users. The issue was caused by a problem introduced by an upstream provider that affected our deployment. The incident was resolved by rolling back the deployment, after which all sites were confirmed to be fully operational.","summary":null,"severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"GitBook","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["gitbook","incident","ops","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"resolved","published_at":"2026-03-06T16:56:58+00:00","first_seen_at":"2026-11-08T16:45:36+00:00","triaged_at":"2026-11-08T16:46:18+00:00","updated_at":"2026-11-08T16:46:18+00:00","category":"vendor","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'01kk219e7dfdqz9tyyq7bgmfga':15A '14':22C,25C '36':23C '404':10A,39C '43':26C 'affect':61C 'back':70C 'caus':51C 'confirm':78C 'custom':6A,34C 'deploy':63C,72C 'document':2A,30C,44C 'domain':7A,35C 'error':11A,42C 'found':41C 'fulli':81C 'gitbook':1A,14A,16A,17B,29C 'inc':13A 'inc-gitbook-01kk219e7dfdqz9tyyq7bgmfga':12A 'incid':18B,65C 'introduc':55C 'issu':49C 'make':43C 'op':19B 'oper':82C 'problem':54C 'provid':59C 'resolv':67C 'return':8A,37C 'roll':69C 'site':3A,31C,76C 'unavail':45C 'upstream':58C 'use':32C 'user':47C 'utc':27C 'vendor':20B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["gitbook"],"ptokens":["gitbook"],"labels":["gitbook","high","incident","ops","vendor"],"campaign_type":null,"search_a":"'01kk219e7dfdqz9tyyq7bgmfga':15A '404':10A 'custom':6A 'document':2A 'domain':7A 'error':11A 'gitbook':1A,14A,16A 'inc':13A 'inc-gitbook-01kk219e7dfdqz9tyyq7bgmfga':12A 'return':8A 'site':3A","search_b":"'gitbook':17B 'incid':18B 'op':19B 'vendor':20B","search_c":"'14':22C,25C '36':23C '404':39C '43':26C 'affect':61C 'back':70C 'caus':51C 'confirm':78C 'custom':34C 'deploy':63C,72C 'document':30C,44C 'domain':35C 'error':42C 'found':41C 'fulli':81C 'gitbook':29C 'incid':65C 'introduc':55C 'issu':49C 'make':43C 'oper':82C 'problem':54C 'provid':59C 'resolv':67C 'return':37C 'roll':69C 'site':31C,76C 'unavail':45C 'upstream':58C 'use':32C 'user':47C 'utc':27C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-03-06T16:56:58+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"statuspage","external_id":"gitbook:01KK219E7DFDQZ9TYYQ7BGMFGA","url":"https://www.gitbookstatus.com/incidents/01KK219E7DFDQZ9TYYQ7BGMFGA","severity":"high","published_at":"2026-03-06T16:56:58+00:00","modified_at":"2026-03-11T15:37:02+00:00","first_seen_at":"2026-11-08T16:45:36+00:00","fetched_at":"2026-11-09T02:40:06+00:00","note":null}],"documents":[],"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"}