CVE-2026-5223
Last modified
CVE-2026-5223 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Rust-Lang | Cargo | < 1.96.0 |
References
- https://blog.rust-lang.org/2026/05/25/cve-2026-5223/Mitigation, Vendor Advisory
- https://github.com/rust-lang/cargo/pull/17031Issue Tracking, Patch
- https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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