CVE-2026-40208

LOW
Published Jun 25, 2026 Modified Jun 25, 2026 CWE-705

Description

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

CVSS v3.1 Score

3.7
LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0029
Probability of exploitation
0.20%
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-705 CWE-705

References

Frequently Asked Questions

What is CVE-2026-40208? +
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame. It has a CVSS v3.1 base score of 3.7 (LOW).
How severe is CVE-2026-40208? +
CVE-2026-40208 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-40208? +
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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