Debian 11 — puma — multiple vulnerabilities (12 CVEs) — patch and remediation guide
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2019-16770 CVE-2020-11076 CVE-2020-11077 CVE-2020-5247 CVE-2020-5249 CVE-2021-29509 CVE-2021-41136 CVE-2022-23634 +4 more Upstream summary: In Puma before versions 3.12.2 and 4.3.1, a poorly-behaved client could use keepalive requests to monopolize […]