CVE-2026-42255

HIGH
Published Apr 26, 2026 Modified Apr 29, 2026 CWE-684

Description

Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation.

CVSS v3.1 Score

7.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

EPSS — Exploit Prediction

0.0004
Probability of exploitation
0.14%
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-684 CWE-684

Affected Products

Vendor Product
technitium dnsserver

References

Frequently Asked Questions

What is CVE-2026-42255? +
Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation. It has a CVSS v3.1 base score of 7.2 (HIGH).
How severe is CVE-2026-42255? +
CVE-2026-42255 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-42255? +
CVE-2026-42255 affects products from technitium, specifically: dnsserver. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-42255? +
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.

Related Vulnerabilities

CVE-2024-50357 9.8

FutureNet NXR series routers provided by Century Systems Co., Ltd. have REST-APIs, which are configured as disabled in the initial …
CVE-2024-6425 9.1

Incorrect Provision of Specified Functionality vulnerability in MESbook 20221021.03 version. An unauthenticated remote attacker can register user accounts without being …
CVE-2025-66384 8.2

app/Controller/EventsController.php in MISP before 2.5.24 has invalid logic in checking for uploaded file validity, related to tmp_name.
CVE-2025-58325 8.2

An Incorrect Provision of Specified Functionality vulnerability [CWE-684] in FortiOS 7.6.0, 7.4.0 through 7.4.5, 7.2.5 through 7.2.10, 7.0.0 through 7.0.15, …
CVE-2025-47227 7.5

In the Production Environment extension in Netmake ScriptCase through 9.12.006 (23), the Administrator password reset mechanism is mishandled. Making both …
CVE-2024-20317 7.4

A vulnerability in the handling of specific Ethernet frames by Cisco IOS XR Software for various Cisco Network Convergence System …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2026-42255 — free, no signup required.

Start Free Scan