# CVE-2026-55708: Privacy/configuration issue when adding local data in views through 'unbound-control'

CVE-2026-55708 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-55708, released July 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-55708
- Priority: Routine
- CVSS: 3.1 (Low)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 22, 2026
- Weakness: Initialization of a Resource with an Insecure Default
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55708

## Description

In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the 'view_local_data' and 'view_local_datas' commands of 'unbound-control' create a bare local zones tree for an already configured named view when the view is configured with no local data to begin with. However, the creation through the control interface omits adding the default-protected zones (e.g., RFC 1918 reverse, AS112 zones, .onion, .localhost). Once the local zone tree exists without the defaults, every query for a default-protected name from a client mapped to that view escapes to the public DNS via the iterator instead of being answered locally, bypassing local policy expectations.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-unbound amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | python3-unbound-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound Debian 13.5 (trixie) | 1.26.1-0+deb13u1 | [DEBIAN-CVE-2026-55708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55708.md) | Jul 28, 2026 |
| Linux | unbound Debian 14 | 1.25.2-1 | [DEBIAN-CVE-2026-55708](https://patchblox.com/security/data/fix/linux/debian-cve-2026-55708.md) | Jul 28, 2026 |
| Linux | unbound amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound opensuse-leap 16.0 | 1.25.2-160000.1.1 | [OPENSUSE-SU-2026:21550-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21550-1.md) | Aug 10, 2026 |
| Linux | unbound sles 15.6 | 1.25.2-150600.23.19.1 | [SUSE-SU-2026:3885-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3885-1.md) | Aug 31, 2026 |
| Linux | unbound sles 15.7 | 1.25.2-150600.23.19.1 | [SUSE-SU-2026:3885-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3885-1.md) | Aug 31, 2026 |
| Linux | unbound sles 16.0 | 1.25.2-160000.1.1 | [SUSE-SU-2026:23226-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23226-1.md) | Aug 10, 2026 |
| Linux | unbound-anchor amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-anchor-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-debugsource amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-devel amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-libs amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-libs-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-utils amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |
| Linux | unbound-utils-debuginfo amzn 2023 | 1.17.1-1.amzn2023.0.13 | [ALAS2023-2026-2033](https://patchblox.com/security/data/fix/linux/alas2023-2026-2033.md) | Aug 3, 2026 |

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Data as of 2026-11-08T13:06:02Z 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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