Security Hardening

Ubuntu 20.04 — nss — multiple vulnerabilities (18 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — nss — multiple vulnerabilities (18 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 29 April 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8071-2 Related CVEs: CVE-2026-2781 https://launchpad.net/bugs/2060906 CVE-2023-4421 CVE-2023-5388 CVE-2023-6135 CVE-2022-3479 CVE-2023-0767 CVE-2022-22747  +10 more Upstream summary: USN-8071-1 fixed a vulnerability in nss. This update provides the corresponding fix for Ubuntu 14.04 […]

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openSUSE Tumbleweed — python311-urllib3_1 — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — python311-urllib3_1 — vulnerability — patch and remediation guide

  • April 29, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2026:21728-1 (see also SUSE bugzilla) Related CVEs: CVE-2026-44431 Upstream summary: urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(…, […]

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Ubuntu 24.04 — openjpeg2 — multiple vulnerabilities (9 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — openjpeg2 — multiple vulnerabilities (9 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2026 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8252-1 Related CVEs: CVE-2026-6192 CVE-2025-54874 CVE-2025-50952 CVE-2024-56826 CVE-2024-56827 CVE-2021-29338 CVE-2021-3575 CVE-2022-1122  +1 more Upstream summary: It was discovered that OpenJPEG did not properly handle memory when encoding image files. An […]

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Ubuntu 22.04 — docker.io-app — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — docker.io-app — multiple vulnerabilities (4 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2026 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8230-1 Related CVEs: CVE-2026-33748 CVE-2026-33747 CVE-2024-29018 CVE-2024-41110 Upstream summary: It was discovered that BuildKit, contained within Docker, incorrectly handled file path validation when processing frontend API messages. An attacker could […]

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SLES 16 — flac — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — flac — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2026 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2014:1577-1 (see also SUSE bugzilla) Related CVEs: CVE-2014-8962 CVE-2014-9028 CVE-2020-0499 CVE-2021-0561 CVE-2017-6888 Upstream summary: Stack-based buffer overflow in stream_decoder.c in libFLAC before 1.3.1 allows remote attackers to execute arbitrary code via a […]

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Red Hat Enterprise Linux 9 — krb5 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Red Hat Enterprise Linux 9

Red Hat Enterprise Linux 9 — krb5 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read  •  Source: Red Hat advisory RHSA RHSA-2026:19357 Related CVEs: CVE-2026-40355 CVE-2026-40356 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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SLES 16 — libvirt-doc — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — libvirt-doc — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 29 April 2026 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2013:1641-1 (see also SUSE bugzilla) Related CVEs: CVE-2013-4296 CVE-2017-1000256 CVE-2019-10132 CVE-2019-10161 CVE-2019-10166 CVE-2019-10167 CVE-2019-10168 CVE-2020-14339  +12 more Upstream summary: The remoteDispatchDomainMemoryStats function in daemon/remote.c in libvirt 0.9.1 through 0.10.1.x, 0.10.2.x before 0.10.2.8, […]

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openSUSE Leap 15.6 — python311-pip — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Leap 15.6

openSUSE Leap 15.6 — python311-pip — multiple vulnerabilities (3 CVEs) — patch and remediation guide

  • April 29, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Leap 15.6 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2024:1639-1 (see also SUSE bugzilla) Related CVEs: CVE-2023-28858 CVE-2023-28859 CVE-2026-1703 Upstream summary: redis-py before 4.5.3 leaves a connection open after canceling an async Redis command at an inopportune time, and can […]

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Oracle Linux 10 — mod_proxy_cluster — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 10

Oracle Linux 10 — mod_proxy_cluster — vulnerability — patch and remediation guide (ELSA-2025-9466)

  • April 29, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 29 April 2026 Affected versions: Oracle Linux 10 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-9466 Related CVEs: CVE-2024-10306 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Windows Server 2019 — KB5073722 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2019

Windows Server 2019 — KB5073722 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Windows Server 2019 📖 ~4 min read  •  Source: Microsoft KB5073722 • MSRC update-guide entry Related CVEs: CVE-2026-20822 CVE-2026-21265 CVE-2026-0386 CVE-2026-20804 CVE-2026-20805 CVE-2026-20809 CVE-2026-20812 CVE-2026-20814  +12 more Affected components: Windows Server 2019 (Server Core installation) Microsoft summary: Use after free in Microsoft […]

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