CVE intelligence

CVE-2026-5222

Vulnerability intelligence

Published May 25, 2026Sources checked Nov 11, 2026

6.5MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-5222 and is rated Medium severity with a CVSS score of 6.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Jun 13, 2026

CBL-Mariner Releases

Vendor-listed releases

1.90.0-9
1.75.0-30

CISA KEVNot listedBased on the latest collected catalog

EPSS0.5%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-5222?

Cargo between 1.68 and 1.96 incorrectly normalized the URLs of third-party registries using the sparse index protocol. If a hosting provider allowed multiple registries to be hosted with arbitrary names within the same domain, an attacker able to publish crates in a registry could obtain the credentials of others users of the same registry.

The severity of the vulnerability is **low**, due to the extremely niche requirements needed to achieve the attack.

Source: NVD