Fail2Ban monitors log files and automatically bans IP addresses that show signs of brute-force activity — too many failed login attempts, repeated bad requests, or other malicious patterns. This guide installs and configures Fail2Ban on Ubuntu 26.04 LTS to protect SSH and other services. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS […]
Jenkins is the most widely used open-source automation server. It supports building, testing, and deploying software through pipelines defined as code (Jenkinsfile). This guide installs Jenkins LTS on Ubuntu 26.04 LTS and secures it behind Nginx with HTTPS. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS with Java 21+ (OpenJDK) Nginx installed […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read • Source: Amazon Linux advisory ALAS2023-2025-1292 Related CVEs: CVE-2025-61962 Upstream summary: In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context. (CVE-2025-61962) Table of […]
MariaDB Galera Cluster is a synchronous multi-primary cluster for MariaDB/MySQL that provides true high availability with no single point of failure. Unlike standard primary-replica replication where only one node accepts writes and replicas are read-only, Galera Cluster allows writes to any node simultaneously — all nodes are always primary, always in sync, and always up-to-date. […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read • Source: Amazon Linux advisory ALAS2023-2025-1330 Related CVEs: CVE-2025-14010 Upstream summary: A flaw was found in ansible-collection-community-general. This vulnerability allows for information exposure (IE) of sensitive credentials, specifically plaintext passwords, via verbose output when running […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.12.11-r0 📖 ~4 min read • Source: Alpine secdb entry — editorconfig 0.12.11-r0 Related CVEs: CVE-2026-40489 Upstream summary: Alpine community repository for vedge ships editorconfig 0.12.11-r0 which addresses CVE-2026-40489. Table of contents Symptom & Impact Environment […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Rocky Linux 10 📖 ~4 min read • Source: Rocky Linux RXSA RLSA-2026:0594 Related CVEs: CVE-2025-12818 Upstream summary: The libpq package provides the PostgreSQL client library, which allows client programs to connect to PostgreSQL servers. Security Fix(es): * postgresql: libpq undersizes allocations, […]
🟡 Medium ⏱ 10–30 min Last verified: 10 July 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2002-1424 CVE-2002-1425 CVE-2011-4919 Upstream summary: Buffer overflow in munpack in mpack 1.5 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code. […]
🟠 High ⏱ 5–30 min Last verified: 10 July 2026 Affected versions: Ubuntu 26.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]
🟢 Low ⏱ 5–15 min Last verified: 10 July 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2022-42964 CVE-2024-23346 Upstream summary: An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the pymatgen PyPI package, when an attacker is able to supply arbitrary […]
