How severe is CVE-2026-5222?

CVE-2026-5222 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-5222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5222?

CVE-2026-5222 affects Rust-lang Cargo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5222?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5222 have an EU (EUVD) identifier?

Yes. CVE-2026-5222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31654.

When was CVE-2026-5222 published?

CVE-2026-5222 was published on 2026-05-25 and last updated on 2026-06-17.

CVE-2026-5222

CVE-2026-5222 is a medium-severity vulnerability in Rust-lang Cargo with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-647.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 2.3
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31654
Weakness: CWE-647
Affected product: Rust-lang Cargo
Published: 2026-05-25
Last modified: 2026-06-17

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.

Frequently asked questions

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.
How severe is CVE-2026-5222?: CVE-2026-5222 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-5222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5222?: CVE-2026-5222 affects Rust-lang Cargo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5222?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5222 have an EU (EUVD) identifier?: Yes. CVE-2026-5222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31654.
When was CVE-2026-5222 published?: CVE-2026-5222 was published on 2026-05-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rust-lang:cargo:*:*:*:*:*:rust:*:*

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