Is CVE-2026-42371 in the CISA KEV catalog?

No. CVE-2026-42371 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42371?

CVE-2026-42371 has a CVSS v3 base score of 5.1 (MEDIUM).

What is the EPSS score for CVE-2026-42371?

CVE-2026-42371 has an EPSS score of 0.17% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42371?

Upgrade uriparser on debian unstable to 1.0.1+dfsg-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-42371

MEDIUM

5.1

CVSS v3

NVD

Description

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

CWE-197

How to fix

Remediation Available

uriparserDebian

Fixed in:1.0.1+dfsg-1CVE-2026-42371

uriparserRed Hat / RHEL

Fixed in:main@noarchRHSA-2026:12430

Fixed in:main@aarch64RHSA-2026:12430

Fixed in:main@srcRHSA-2026:12430

Fixed in:main@x86_64RHSA-2026:12430

uriparserRocky

Fixed in:main@noarchRHSA-2026:12430

Fixed in:main@aarch64RHSA-2026:12430

Fixed in:main@srcRHSA-2026:12430

Fixed in:main@x86_64RHSA-2026:12430

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.17%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

openwall.com

Product1

uriparser.github.io

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-18.