python3-unbound 1.6.7-1ubuntu2.6+esm6: python3-unbound 1.6.7-1ubuntu2.6+esm6 for Ubuntu 18.04.6 LTS (bionic)

python3-unbound 1.6.7-1ubuntu2.6+esm6, released September 16, 2026, fixes 6 CVEs in python3-unbound. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

High1 publicly disclosedUnsupported product

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.9999

99th percentile

Priority of the 6 CVEs

Patch now 0
                                Urgent 0
                                High 6
                                Routine 0

Fixed package versions

Product	Release	Fixed in
python3-unbound	Ubuntu 18.04.6 LTS (bionic)	1.6.7-1ubuntu2.6+esm6

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2023-50387	MITRE: CVE-2023-50387 DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers	7.5	0.9999	Exploitation Less Likely
High	CVE-2023-50868	MITRE: CVE-2023-50868 NSEC3 closest encloser proof can exhaust CPU	7.5	0.7430	DisclosedExploitation Less Likely
High	CVE-2026-85501	Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC	7.5	0.0048	None reported
High	CVE-2026-81634	Possible heap buffer overflow during DNSSEC canonicalization	9.8	0.0048	None reported
High	CVE-2026-40691	Packet of death for DNSCrypt over TCP	7.5	0.0029	None reported
High	CVE-2026-50252	Possible cache poisoning attack by mapping source port population per thread	9.3	0.0017	None reported

Also fixes CVE-2023-50387

KB5034770
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5034768
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems and 2 more
KB5034769
Windows Server 2022, 23H2 Edition (Server Core installation)
KB5034767
Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more
KB5034819
Microsoft Defender for Endpoint for Windows on Windows Server 2012 R2, Microsoft Defender for Endpoint for Windows on Windows Server 2012 R2 (Server Core installation), Windows Server 2012 R2 and 1 more
KB5034830
Microsoft Defender for Endpoint for Windows on Windows Server 2012, Microsoft Defender for Endpoint for Windows on Windows Server 2012 (Server Core installation), Windows Server 2012 and 1 more
KB5034809
Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
KB5034831
Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)

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