Debian 12 — kf5-messagelib — multiple vulnerabilities (6 CVEs) — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2017-17689 CVE-2017-9604 CVE-2018-19516 CVE-2019-10732 CVE-2021-31855 CVE-2025-69412 Upstream summary: The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. […]