DNS over HTTPS ACL bypass

Description

When the early_acl_drop (earlyACLDrop in Lua) option is disabled (default is enabled) on a DNS over HTTPs frontend using the nghttp2 provider, the ACL check is skipped, allowing all clients to send DoH queries regardless of the configured ACL.

Scores

EPSS (exploitation in 30 days)

0.15% · top 95% 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 6.5.

Weakness

• Incorrect Authorization
• CWE-863 Incorrect Authorization (opens in a new tab)All about CWE-863 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-2026-24029](https://trackcve.app/badge/CVE-2026-24029.svg)](https://trackcve.app/cve/CVE-2026-24029)

Record last updated 31 Mar 2026, 13:15 UTC.