| Name | CVE-2026-40011 |
| Description | An attacker sending a large number of crafted DNS queries might be able to trigger a dynamic block being inserted with a value causing invalid output to be produced in the prometheus endpoint. The prometheus endpoint will then be rejected by the scraper until the dynamic block expires. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6367-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| dnsdist (PTS) | bullseye | 1.5.1-3 | vulnerable |
| bookworm | 1.7.3-2 | vulnerable |
| trixie (security), trixie | 1.9.15-0+deb13u1 | fixed |
| forky, sid | 2.1.0-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| dnsdist | source | bullseye | (unfixed) | end-of-life | | |
| dnsdist | source | bookworm | (unfixed) | end-of-life | | |
| dnsdist | source | trixie | 1.9.15-0+deb13u1 | | DSA-6367-1 | |
| dnsdist | source | (unstable) | 2.1.0-1 | | | |
Notes
[bookworm] - dnsdist <end-of-life> (See #1119290)
[bullseye] - dnsdist <end-of-life> (see #1119290)
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html#cve-2026-40011-prometheus-denial-of-service-via-crafted-dns-queries