Security Hardening

Debian 13 — flex — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — flex — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 April 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2006-0459 CVE-2010-0634 CVE-2016-6354 CVE-2019-6293 Upstream summary: flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing […]

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Windows Server 2025 — KB5087537 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2025

Windows Server 2025 — KB5087537 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Windows Server 2025 📖 ~4 min read  •  Source: Microsoft KB5087537 • MSRC update-guide entry Related CVEs: CVE-2026-35421 CVE-2026-41089 CVE-2026-32161 CVE-2026-40403 CVE-2026-21530 CVE-2026-33834 CVE-2026-34329 CVE-2026-34330  +12 more Affected components: Windows Server 2025 Microsoft summary: Heap-based buffer overflow in Windows GDI allows an […]

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Debian 12 — node-webfont — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — node-webfont — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 April 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2023-26920 CVE-2026-25896 CVE-2026-26278 CVE-2026-27942 CVE-2026-33036 CVE-2026-33349 CVE-2026-41650 Upstream summary: fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Debian 12 — php-phpseclib3 — multiple vulnerabilities (10 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — php-phpseclib3 — multiple vulnerabilities (10 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 April 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2021-30130 CVE-2023-27560 CVE-2023-48795 CVE-2023-49316 CVE-2023-52892 CVE-2024-27354 CVE-2024-27355 CVE-2026-32935  +2 more Upstream summary: phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification. Table of contents […]

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Debian 12 — python-lupa — vulnerability — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — python-lupa — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 April 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2026-34444 Upstream summary: Lupa integrates the runtimes of Lua or LuaJIT2 into CPython. In 2.6 and earlier, attribute_filter is not consistently applied when attributes are accessed through built-in […]

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Debian 13 — python-clickhouse-driver — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — python-clickhouse-driver — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 April 2026 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-26759 Upstream summary: clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due […]

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Windows Server 2022 — KB5079420 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2022

Windows Server 2022 — KB5079420 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Windows Server 2022 📖 ~4 min read  •  Source: Microsoft KB5079420 • MSRC update-guide entry Related CVEs: CVE-2026-23669 CVE-2026-23671 CVE-2026-23672 CVE-2026-23673 CVE-2026-24283 CVE-2026-24285 CVE-2026-24287 CVE-2026-24289  +12 more Affected components: Windows Server 2022 Windows Server 2022, 23H2 Edition (Server Core installation) Microsoft summary: […]

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Debian 12 — rclone — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — rclone — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 April 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-28924 CVE-2024-52522 CVE-2026-41176 CVE-2026-41179 Upstream summary: An issue was discovered in Rclone before 1.53.3. Due to the use of a weak random number generator, the password generator has […]

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Ubuntu 24.04 — libheif — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — libheif — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 April 2026 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7952-1 Related CVEs: CVE-2024-25269 CVE-2025-68431 CVE-2024-41311 Upstream summary: It was discovered that libheif did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a […]

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CHAT