CVE-2026-33596

Description

A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.

CVSS v3.1 Score

3.1

LOW

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

EPSS — Exploit Prediction

0.0000

Probability of exploitation

0.00%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
powerdns	dnsdist	1.9.0 — 1.9.13
powerdns	dnsdist	2.0.0 — 2.0.4

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2026-33596? +

A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend. It has a CVSS v3.1 base score of 3.1 (LOW).

How severe is CVE-2026-33596? +

CVE-2026-33596 has a CVSS v3.1 score of 3.1 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0000, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-33596? +

CVE-2026-33596 affects products from powerdns, specifically: dnsdist. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-33596? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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