CVE catalog
CVE-2026-33254
An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | dnsdist | sid | 2.1.3-1 | fixed |
| Debian | dnsdist | forky | 2.1.3-1 | fixed |
| Debian | dnsdist | trixie | 1.9.16-0+deb13u1 | fixed |
| Debian | dnsdist | trixie-security | 1.9.16-0+deb13u1 | fixed |
| Debian | dnsdist | bookworm | 1.7.3-2 | vulnerable |
| Cpe | dnsdist | Not reported | Not reported | vulnerable |
| Cpe | dnsdist | Not reported | 1.9.13 | fixed |
| Cpe | dnsdist | Not reported | 2.0.4 | fixed |
| Opensuse | dnsdist | tumbleweed | 2.0.5-1.1 | fixed |
| Cpe | dnsdist | Not reported | 2.0.4 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dnsdist | source | sid | 2.0.4-1 | not yet assigned | Not reported | Not reported |
| Debian | dnsdist | source | forky | 2.0.4-1 | not yet assigned | Not reported | Not reported |
| Debian | dnsdist | source | trixie | 1.9.14-0+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | dnsdist | source | bookworm | (unfixed) | end-of-life | Not reported | Not reported |
| Cpe | dnsdist | cpe | Not reported | 1.9.13 | Not reported | Not reported | Not reported |
| Cpe | dnsdist | cpe | Not reported | 2.0.4 | Not reported | Not reported | Not reported |
| Opensuse | dnsdist | rpm | tumbleweed | 2.0.5-1.1 | Not reported | OPENSUSE-SU-2026:10632-1 | Not reported |
| Cpe | dnsdist | cpe | Not reported | 2.0.4 | Not reported | NVD-CVE-2026-33254 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [dnsdist]Affected
Details (2)
1.7.3-2· amd64 · bookwormAffected
nvd · dnsdist · debian · bookworm; nvd · dnsdist · debian · 12
1.7.3-2· arm64 · bookwormAffected
nvd · dnsdist · debian · bookworm; nvd · dnsdist · debian · 12
[Debian 13 (Trixie)]
- [dnsdist]Fixed
Details (4)
1.9.15-0+deb13u1· amd64 · trixieFixed · Fixed:
1.9.14-0+deb13u1nvd · dnsdist · debian · 13
1.9.15-0+deb13u1· arm64 · trixieFixed · Fixed:
1.9.14-0+deb13u1nvd · dnsdist · debian · 13
1.9.16-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.9.14-0+deb13u1nvd · dnsdist · debian · 13
1.9.16-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
1.9.14-0+deb13u1nvd · dnsdist · debian · 13
[openSUSE Tumbleweed]
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10632-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33254]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33254]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10632-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-33254]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33254.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1230.json]
- [https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]