# CVE-2024-1931: unbound: NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of...

CVE-2024-1931 is fixed in 5 products on 1 platform, first by libunbound8 1.19.2-1ubuntu1, released March 7, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-1931
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0252
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 7, 2024

## Description

NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libunbound8 Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu1 | [libunbound8 1.19.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libunbound8-1.19.2-1ubuntu1.md) | Mar 7, 2024 |
| Linux | python3-unbound Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu1 | [python3-unbound 1.19.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-unbound-1.19.2-1ubuntu1.md) | Mar 7, 2024 |
| Linux | unbound Debian 13.5 (trixie) | 1.19.2-1 | [DEBIAN-CVE-2024-1931](https://patchblox.com/security/data/fix/linux/debian-cve-2024-1931.md) | Mar 7, 2024 |
| Linux | unbound Debian 14 | 1.19.2-1 | [DEBIAN-CVE-2024-1931](https://patchblox.com/security/data/fix/linux/debian-cve-2024-1931.md) | Mar 7, 2024 |
| Linux | unbound Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu1 | [unbound 1.19.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-1.19.2-1ubuntu1.md) | Mar 7, 2024 |
| Linux | unbound-anchor Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu1 | [unbound-anchor 1.19.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-anchor-1.19.2-1ubuntu1.md) | Mar 7, 2024 |
| Linux | unbound-host Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu1 | [unbound-host 1.19.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-unbound-host-1.19.2-1ubuntu1.md) | Mar 7, 2024 |

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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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