# CVE-2020-19860: ldns: When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read...

CVE-2020-19860 is fixed in 6 products on 1 platform, first by ldnsutils 1.7.0-3ubuntu4.1, released January 21, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-19860
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0122
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 21, 2022

## Description

When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ldns Debian 12.15 (bookworm) | 1.8.1-1 | [DEBIAN-CVE-2020-19860](https://patchblox.com/security/data/fix/linux/debian-cve-2020-19860.md) | Jan 21, 2022 |
| Linux | ldns Debian 13.5 (trixie) | 1.8.1-1 | [DEBIAN-CVE-2020-19860](https://patchblox.com/security/data/fix/linux/debian-cve-2020-19860.md) | Jan 21, 2022 |
| Linux | ldns Debian 14 | 1.8.1-1 | [DEBIAN-CVE-2020-19860](https://patchblox.com/security/data/fix/linux/debian-cve-2020-19860.md) | Jan 21, 2022 |
| Linux | ldnsutils Ubuntu 18.04.6 LTS (bionic) | 1.7.0-3ubuntu4.1 | [ldnsutils 1.7.0-3ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ldnsutils-1.7.0-3ubuntu4.1.md) | Jan 21, 2022 |
| Linux | ldnsutils Ubuntu 20.04 LTS (focal) | 1.7.0-4.1ubuntu1+esm1 | [ldnsutils 1.7.0-4.1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ldnsutils-1.7.0-4.1ubuntu1-esm1.md) | Jan 21, 2022 |
| Linux | ldnsutils Ubuntu 22.04.1 LTS (jammy) | 1.7.1-2ubuntu4+esm1 | [ldnsutils 1.7.1-2ubuntu4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ldnsutils-1.7.1-2ubuntu4-esm1.md) | Jan 21, 2022 |
| Linux | libldns2 Ubuntu 18.04.6 LTS (bionic) | 1.7.0-3ubuntu4.1 | [libldns2 1.7.0-3ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libldns2-1.7.0-3ubuntu4.1.md) | Jan 21, 2022 |
| Linux | libldns2 Ubuntu 20.04 LTS (focal) | 1.7.0-4.1ubuntu1+esm1 | [libldns2 1.7.0-4.1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libldns2-1.7.0-4.1ubuntu1-esm1.md) | Jan 21, 2022 |
| Linux | libldns3 Ubuntu 22.04.1 LTS (jammy) | 1.7.1-2ubuntu4+esm1 | [libldns3 1.7.1-2ubuntu4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libldns3-1.7.1-2ubuntu4-esm1.md) | Jan 21, 2022 |
| Linux | python-ldns Ubuntu 18.04.6 LTS (bionic) | 1.7.0-3ubuntu4.1 | [python-ldns 1.7.0-3ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-ldns-1.7.0-3ubuntu4.1.md) | Jan 21, 2022 |
| Linux | python-ldns Ubuntu 20.04 LTS (focal) | 1.7.0-4.1ubuntu1+esm1 | [python-ldns 1.7.0-4.1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-ldns-1.7.0-4.1ubuntu1-esm1.md) | Jan 21, 2022 |
| Linux | python3-ldns Ubuntu 18.04.6 LTS (bionic) | 1.7.0-3ubuntu4.1 | [python3-ldns 1.7.0-3ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-ldns-1.7.0-3ubuntu4.1.md) | Jan 21, 2022 |
| Linux | python3-ldns Ubuntu 20.04 LTS (focal) | 1.7.0-4.1ubuntu1+esm1 | [python3-ldns 1.7.0-4.1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-ldns-1.7.0-4.1ubuntu1-esm1.md) | Jan 21, 2022 |
| Linux | python3-ldns Ubuntu 22.04.1 LTS (jammy) | 1.7.1-2ubuntu4+esm1 | [python3-ldns 1.7.1-2ubuntu4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-ldns-1.7.1-2ubuntu4-esm1.md) | Jan 21, 2022 |

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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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