{"action":"Upgrade bouncycastle to 1.86-1 or later.","affected":[{"fixed":"1.86-1","introduced":"0"}],"component":"bouncycastle","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1.86-1"],"id":"tcs_01M5NT5JETBR1236T92QY89G8M","modified_at":"2026-10-03T04:00:08.460939260Z","published_at":"2026-08-03T01:16:43.543Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-59638","https://security-tracker.debian.org/tracker/CVE-2026-59638"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-59638#Debian:14/bouncycastle","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-59638"}],"summary":"In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Ca"}