# 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.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-unbound-1.6.7-1ubuntu2.6-esm6
- Platform: Linux
- Released: Sep 16, 2026
- Priority: High (Closes CVE-2023-50387, high severity)
- CVEs: 6, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [python3-unbound](https://patchblox.com/security/data/product/linux/python3-unbound.md) | Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm6 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-50387](https://patchblox.com/security/data/cve/CVE-2023-50387.md) | High | MITRE: CVE-2023-50387 DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers | 7.5 | 0.9999 |  |
| [CVE-2023-50868](https://patchblox.com/security/data/cve/CVE-2023-50868.md) | High | MITRE: CVE-2023-50868 NSEC3 closest encloser proof can exhaust CPU | 7.5 | 0.7430 | Disclosed |
| [CVE-2026-85501](https://patchblox.com/security/data/cve/CVE-2026-85501.md) | High | Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC | 7.5 | 0.0048 |  |
| [CVE-2026-81634](https://patchblox.com/security/data/cve/CVE-2026-81634.md) | High | Possible heap buffer overflow during DNSSEC canonicalization | 9.8 | 0.0048 |  |
| [CVE-2026-40691](https://patchblox.com/security/data/cve/CVE-2026-40691.md) | High | Packet of death for DNSCrypt over TCP | 7.5 | 0.0029 |  |
| [CVE-2026-50252](https://patchblox.com/security/data/cve/CVE-2026-50252.md) | High | Possible cache poisoning attack by mapping source port population per thread | 9.3 | 0.0017 |  |

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Data as of 2026-11-11T13:47:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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