CVE-2026-42371: uriparser before 1.0.1 has numeric truncation in text range comparison, if an application accepts URIs with a

Q: How do I fix CVE-2026-42371?

uriparser: upgrade to 1.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-42371 being exploited?

CVE-2026-42371 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42371 affect?

CVE-2026-42371 affects uriparser. Severity is medium (CVSS 5.1). uriparser before 1.0.1 has numeric truncation in text range comparison, if an application accepts URIs with a length in gigabytes.

Q: How urgent is CVE-2026-42371?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 5.1UPGRADE

CVE-2026-42371 is a medium-severity flaw (CVSS 5.1) affecting uriparser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-197
Published	2026-04-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uriparser project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-27 07:16 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

uriparser project uriparser UPGRADE

Affected: < 1.0.1

Fixed in: 1.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy uriparser || rpm -q uriparser || uriparser --version

2. UPGRADE to 1.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade uriparser

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade uriparser

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42371?

uriparser: upgrade to 1.0.1. Exact commands for each OS are on this page.

Is CVE-2026-42371 being exploited?

CVE-2026-42371 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42371 affect?

CVE-2026-42371 affects uriparser. Severity is medium (CVSS 5.1). uriparser before 1.0.1 has numeric truncation in text range comparison, if an application accepts URIs with a length in gigabytes.

How urgent is CVE-2026-42371?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2026-44928 LOW 2.9 UPGRADE In uriparser before 1.0.2, the function family EqualsUri can misclassify two unequal URIs as equal.
CVE-2026-44927 LOW 2.9 UPGRADE In uriparser before 1.0.2, there is pointer difference truncation to int in various places.

References

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