What is CVE-2026-13676?

CVE-2026-13676 is a high-severity vulnerability in Fast-uri, classified under CWE-436. CVSS score: 7.5/10. Published 2026-06-29.

How severe is CVE-2026-13676?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Fast-uri

CVE-2026-13676

fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its o…

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Fast-uri — versions 4.0.0, 4.0.1, 2.3.1

Weakness classification (CWE)

CWE-436
CWE-551

References

ce714d77-add3-4f53-aff5-83d477b104bb
ce714d77-add3-4f53-aff5-83d477b104bb
0b0ca135-0b70-47e7-9f44-1890c2a1c46c
0b0ca135-0b70-47e7-9f44-1890c2a1c46c
0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Frequently asked questions

What is CVE-2026-13676?: CVE-2026-13676 is a high-severity vulnerability in Fast-uri, classified under CWE-436. CVSS score: 7.5/10. Published 2026-06-29.
How severe is CVE-2026-13676?: High severity. CVSS v3 base score is 7.5 out of 10.