CVE-2026-5222
Last modified
CVE-2026-5222 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Rust-Lang | Cargo | >= 1.68.0, < 1.96.0 |
References
- https://blog.rust-lang.org/2026/05/25/cve-2026-5222/Vendor Advisory
- https://github.com/rust-lang/cargo/pull/17031Issue Tracking, Patch
- https://groups.google.com/g/rustlang-security-announcements/c/SfUxOiIdY5sMailing 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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