What’s Vulnerable › Vulnerabilities

CVE-2026-5222: Cargo can be coerced to share credentials between registries

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-25 · updated 2026-07-23
• Weakness: CWE-647

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.

Affected products

• rust-lang cargo: from 1.68.0 before 1.96.0 — fixed in 1.96.0

How to fix

Upgrade to a fixed version: rust-lang cargo 1.96.0. Check the vendor advisory for mitigations.

References

• https://blog.rust-lang.org/2026/05/25/cve-2026-5222/
• https://github.com/rust-lang/cargo/pull/17031
• https://groups.google.com/g/rustlang-security-announcements/c/SfUxOiIdY5s

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