How severe is CVE-2026-33602?

CVE-2026-33602 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2026-33602 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33602?

CVE-2026-33602 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33602?

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

Does CVE-2026-33602 have an EU (EUVD) identifier?

Yes. CVE-2026-33602 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24943.

When was CVE-2026-33602 published?

CVE-2026-33602 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-33602

CVE-2026-33602 is a medium-severity vulnerability in Powerdns Dnsdist with a CVSS 3.x base score of 6.5. 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-122.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24943
Weakness: CWE-122
Affected product: Powerdns Dnsdist
Published: 2026-04-22
Last modified: 2026-06-17

Description

A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.

Frequently asked questions

What is CVE-2026-33602?: A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.
How severe is CVE-2026-33602?: CVE-2026-33602 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2026-33602 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33602?: CVE-2026-33602 affects Powerdns Dnsdist. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33602?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33602 have an EU (EUVD) identifier?: Yes. CVE-2026-33602 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24943.
When was CVE-2026-33602 published?: CVE-2026-33602 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-2026-24029 — 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…
CVE-2016-7069 — Medium (CVSS 5.9): An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a…

All CVEs affecting Powerdns Dnsdist →

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities

CVE-2026-46752 — Critical (CVSS 10.0): Redis Lua HEAP overflow in cjson library vulnerability in Apache Kvrocks. This issue affects Apache Kvrocks: from…
CVE-2026-24822 — Critical (CVSS 10.0): Out-of-bounds Write, Heap-based Buffer Overflow vulnerability in ttttupup wxhelper (src modules). This vulnerability is…
CVE-2025-23123 — Critical (CVSS 10.0): A malicious actor with access to the management network could execute a remote code execution (RCE) by exploiting a…
CVE-2022-34819 — Critical (CVSS 10.0): A vulnerability has been identified in SIMATIC CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions <…
CVE-2026-44050 — Critical (CVSS 9.9): A heap-based buffer overflow in the CNID daemon comm_rcv() function in Netatalk 2.0.0 through 4.4.2 allows a remote…
CVE-2026-49841 — Critical (CVSS 9.8): FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to…

Browse all CWE-122 (Heap-based Buffer Overflow) vulnerabilities →