What is CVE-2026-42371?

CVE-2026-42371 is a medium-severity vulnerability in Uriparser, classified under CWE-197. CVSS score: 5.1/10. Published 2026-04-27.

How severe is CVE-2026-42371?

Medium severity. CVSS v3 base score is 5.1 out of 10.

Vulnerability in Uriparser

CVE-2026-42371

uriparser before 1.0.1 has numeric truncation in text range comparison, if an application accepts URIs with a length in gigabytes.

Published 2026-04-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (5.2th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Uriparser — versions 0
Uriparser Project

Weakness classification (CWE)

CWE-197

References

github.com/uriparser/uriparser/pull/298 (Patch, Issue Tracking)
uriparser.github.io (Product)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-42371?: CVE-2026-42371 is a medium-severity vulnerability in Uriparser, classified under CWE-197. CVSS score: 5.1/10. Published 2026-04-27.
How severe is CVE-2026-42371?: Medium severity. CVSS v3 base score is 5.1 out of 10.