What is CVE-2026-33490?

CVE-2026-33490 is a low-severity vulnerability in H3js H3, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 3.7/10. Published 2026-03-26.

How severe is CVE-2026-33490?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in H3js H3

CVE-2026-33490

H3 is a minimal H(TTP) framework. In versions 2.0.0-0 through 2.0.1-rc.16, the `mount()` method in h3 uses a simple `startsWith()` check to determine whether incoming requests fall under a mounted sub-application's path prefix. Because thi…

EPSS: 0.000 (6.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

H3js H3 — versions >= 2.0.1-alpha.0, < 2.0.1-rc.17

Weakness classification (CWE)

CWE-706 — Use of Incorrectly-Resolved Name or Reference

References

https://github.com/h3js/h3/security/advisories/GHSA-2j6q-whv2-gh6w (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33490?: CVE-2026-33490 is a low-severity vulnerability in H3js H3, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 3.7/10. Published 2026-03-26.
How severe is CVE-2026-33490?: Low severity. CVSS v3 base score is 3.7 out of 10.