# CVE-2018-20103: haproxy: An issue was discovered in dns.c in HAProxy through 1.8.14

CVE-2018-20103 is fixed in 2 products on 1 platform, first by haproxy 1.8.8-1ubuntu0.3, released December 30, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-20103
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0659
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 11, 2018

## Description

An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | haproxy Ubuntu 18.04.6 LTS (bionic) | 1.8.8-1ubuntu0.3 | [haproxy 1.8.8-1ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-haproxy-1.8.8-1ubuntu0.3.md) | Dec 30, 2018 |
| Linux | vim-haproxy Ubuntu 18.04.6 LTS (bionic) | 1.8.8-1ubuntu0.3 | [vim-haproxy 1.8.8-1ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-vim-haproxy-1.8.8-1ubuntu0.3.md) | Dec 30, 2018 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo