Unbounded memory allocation for DoQ and DoH3

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.

Scores

EPSS (exploitation in 30 days)

0.56% · top 53% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

• Uncontrolled Memory Allocation
• CWE-789 Memory Allocation with Excessive Size Value (opens in a new tab)All about CWE-789 and its CVEs

Affected products

• PowerDNS · DNSdist

  • affected 1.9.0 – < 1.9.12
  • affected 2.0.0 – < 2.0.3

References (1)

• https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-24030](https://trackcve.app/badge/CVE-2026-24030.svg)](https://trackcve.app/cve/CVE-2026-24030)

Record last updated 31 Mar 2026, 13:14 UTC.