CVE-2026-40211

mediumpriority · track · 0EPSS 0.007 · 53 %ileDEEU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.70% (53rd) EPSS

CVSS 5.3 · medium

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · security@open-xchange.comexploitability 3.9 · impact 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770US

affected products (16)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Open Source PowerDNS DNSdist <1.9.15all versionscert_bundDE
Open Source PowerDNS DNSdist <2.0.7all versionscert_bundDE
Open Source PowerDNS Recursor <5.2.11all versionscert_bundDE
Open Source PowerDNS Recursor <5.3.8all versionscert_bundDE
Open Source PowerDNS Recursor <5.4.3all versionscert_bundDE
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source PowerDNS≤ DNSdist <1.9.15cert_bundDE
Open Source PowerDNS≤ DNSdist <2.0.7cert_bundDE
Open Source PowerDNS≤ Recursor <5.2.11cert_bundDE
Open Source PowerDNS≤ Recursor <5.3.8cert_bundDE
Open Source PowerDNS≤ Recursor <5.4.3cert_bundDE
PowerDNS dnsdist1.9.0 → 1.9.15enisa_euvdEU
PowerDNS dnsdist2.0.0 → 2.0.7enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2091PowerDNS: Mehrere SchwachstellenDeutsch2026-06-25csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in PowerDNS ausnutzen, um Denial-of-Service-Zustände herbeizuführen, DNS-Caches zu manipulieren, Sicherheitsprüfungen zu umgehen, vertrauliche Informationen offenzulegen, DNSSEC-Validierungen zu beeinträchtigen oder die Integrität und Verfügbarkeit der DNS-Auflösung zu beeinflussen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-06-25modified 2026-10-25

references (3)

External citations — patches, advisories, analysis.

scry

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