Published May 25, 2026Sources checked Nov 13, 2026
5.3MEDIUMCVSS out of 10
What this means
Review the available evidence
CVE-2026-5223 and is rated Medium severity with a CVSS score of 5.3. 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
EPSS0.3%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-5223?
Cargo incorrectly handled symlinks inside of crate tarballs downloaded from third-party registries, allowing a malicious crate to override the source code of another crate from the same registry. The severity of the vulnerability is **medium** for users of third-party registries.
Users of crates.io are **not affected**, as crates.io forbids uploading crates containing any symlink.