How severe is CVE-2026-33599?

CVE-2026-33599 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-33599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33599?

CVE-2026-33599 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33599?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33599 have an EU (EUVD) identifier?

Yes. CVE-2026-33599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24941.

When was CVE-2026-33599 published?

CVE-2026-33599 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-33599

CVE-2026-33599 is a low-severity vulnerability in Powerdns Dnsdist with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24941
Weakness: CWE-125
Affected product: Powerdns Dnsdist
Published: 2026-04-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33599?: 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.
How severe is CVE-2026-33599?: CVE-2026-33599 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-33599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33599?: CVE-2026-33599 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33599 have an EU (EUVD) identifier?: Yes. CVE-2026-33599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24941.
When was CVE-2026-33599 published?: CVE-2026-33599 was published on 2026-04-22 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*

More vulnerabilities in Powerdns Dnsdist

CVE-2017-7557 — High (CVSS 8.8): dnsdist version 1.1.0 is vulnerable to a flaw in authentication mechanism for REST API potentially allowing CSRF attack.
CVE-2026-33593 — High (CVSS 7.5): A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
CVE-2026-33602 — Medium (CVSS 6.5): A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value,…
CVE-2026-24029 — Medium (CVSS 6.5): When the early_acl_drop (earlyACLDrop in Lua) option is disabled (default is enabled) on a DNS over HTTPs frontend…
CVE-2026-27853 — Medium (CVSS 5.9): An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the…
CVE-2018-14663 — Medium (CVSS 5.9): An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing…

All CVEs affecting Powerdns Dnsdist →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →