CVE-2026-33599 | BDVDB-2026-328449 Detail

PowerDNSDNSdist

Description#

A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact low. Attack vector: adjacent.

Weaknesses#

CWE-125 Out-of-bounds Read

References#

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html

Exploit#

No public exploit known

History#

Version 12026-04-22Record published in the CVE List.

Published

Published: 2026-04-22
Last modified: 2026-04-22

Vendor information

Vendor: PowerDNS
Product: DNSdist

All PowerDNS vulnerabilities

Score

3.1 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 21.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 1.9.0 and < 1.9.13
Fixed
1.9.13
Vulnerable
>= 2.0.0 and < 2.0.4
Fixed
2.0.4

Scoring System

CVSS v4.0

Not available

CVSS v3.1

3.1 Low

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Metric breakdown
Attack Vector	Adjacent
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).