{"action":"Upgrade isync to 1.4.4-1 or later.","affected":[{"fixed":"1.4.4-1","introduced":"0"}],"component":"isync","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1.4.4-1"],"id":"tcs_01M5NFTKZ2XEHT0AA9M71Z52F6","modified_at":"2026-10-23T18:05:22.951680689Z","published_at":"2022-02-18T18:15:09.603Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-3657","https://security-tracker.debian.org/tracker/CVE-2021-3657"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-3657#Debian:14/isync","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-3657"}],"summary":"A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email"}