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Common Problems 116047

Ubuntu 26.04 LTS – OpenSSH login denied due to strict AllowUsers policy – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 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 […]

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FreeBSD 15 — openvpn-polarssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — openvpn-polarssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: OpenVPN — out-of-bounds write in legacy key-method 1 Related CVEs: CVE-2017-12166 CVE-2017-7478 CVE-2017-7479 CVE-2017-7508 CVE-2017-7512 CVE-2017-7520 CVE-2017-7521 CVE-2017-7522 Upstream summary: Steffan Karger reports: The bounds check in read_key() was performed […]

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FreeBSD 15 — rubygem-ruby-saml — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — rubygem-ruby-saml — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 27 July 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: ruby-saml — XML signature wrapping attack Related CVEs: CVE-2016-5697 Upstream summary: RubySec reports: ruby-saml prior to version 1.3.0 is vulnerable to an XML signature wrapping attack in the specific scenario […]

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FreeBSD 15 — optipng — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — optipng — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: PptiPNG — Global-buffer-overflow Related CVEs: CVE-2008-5101 CVE-2012-4432 CVE-2015-7801 CVE-2015-7802 CVE-2016-2191 CVE-2016-3981 CVE-2016-3982 CVE-2023-43907 Upstream summary: Frank-Z7 reports: Running optipng with the "-zm 3 -zc 1 -zw 256 -snip -out" configuration […]

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Alpine Linux edge — avahi — multiple vulnerabilities (18 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — avahi — multiple vulnerabilities (18 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 0.8-r5 📖 ~4 min read  •  Source: Alpine secdb entry — avahi 0.8-r5 Related CVEs: CVE-2021-3502 CVE-2021-3468 CVE-2026-34933 CVE-2025-68276 CVE-2025-68468 CVE-2025-68471 CVE-2026-24401 CVE-2024-52615  +10 more Upstream summary: Alpine main repository for vedge ships avahi 0.8-r5 which […]

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FreeBSD 15 — ru-apache+mod_ssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — ru-apache+mod_ssl — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Apache 1.3 — mod_proxy reverse proxy exposure Related CVEs: CVE-2003-0993 CVE-2004-0700 CVE-2004-0885 CVE-2004-0940 CVE-2005-2088 CVE-2005-3352 CVE-2006-3747 CVE-2011-3368 Upstream summary: Apache HTTP server project reports: An exposure was found when using […]

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Debian 12 — ocaml — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — ocaml — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2012-0839 CVE-2015-8869 CVE-2017-9779 CVE-2018-9838 CVE-2026-28364 CVE-2026-34353 Upstream summary: OCaml 3.12.1 and earlier computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers […]

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Debian 13 — pyyaml — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — pyyaml — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2014-9130 CVE-2017-18342 CVE-2019-20477 CVE-2020-14343 CVE-2020-1747 Upstream summary: scanner.c in LibYAML 0.1.5 and 0.1.6, as used in the YAML-LibYAML (aka YAML-XS) module for Perl, allows context-dependent attackers to cause […]

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openSUSE Tumbleweed — mupdf — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — mupdf — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2016-10132 CVE-2016-10141 CVE-2025-55780 CVE-2026-25556 CVE-2016-8729 CVE-2017-17858 CVE-2017-5627 CVE-2017-5628  +12 more Upstream summary: regexp.c in Artifex Software, Inc. MuJS allows attackers to cause a denial of […]

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