🛡️ CVE-2026-33595 — dnsdist

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-770 NVD

5.3

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-33595 is classified as CWE-770: Allocation of Resources Without Limits. Resources are allocated on request with no cap, so a client can exhaust them.

Affected software

CVE-2026-33595 is recorded against 1 package.

dnsdist (from 2.0.0 up to 2.0.4)

Timeline and source

Published on 22 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

www.dnsdist.org

CVE-2026-33595 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity MEDIUM

CVSS Score 5.3

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

CWE CWE-770

Public Exploit ✅ No

Source NVD

Published 2026-04-22

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
dnsdist	2.0.0	2.0.4

References

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

🔗 NVD 🔗 Mitre

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