How severe is CVE-2026-5223?

CVE-2026-5223 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-5223 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5223?

CVE-2026-5223 affects Rust-lang Cargo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5223?

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

Does CVE-2026-5223 have an EU (EUVD) identifier?

Yes. CVE-2026-5223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31658.

When was CVE-2026-5223 published?

CVE-2026-5223 was published on 2026-05-25 and last updated on 2026-06-17.

CVE-2026-5223

CVE-2026-5223 is a medium-severity vulnerability in Rust-lang Cargo with a CVSS 3.x base score of 5.3. 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-61.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.5
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31658
Weakness: CWE-61
Affected product: Rust-lang Cargo
Published: 2026-05-25
Last modified: 2026-06-17

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.

Frequently asked questions

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.
How severe is CVE-2026-5223?: CVE-2026-5223 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-5223 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5223?: CVE-2026-5223 affects Rust-lang Cargo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5223?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5223 have an EU (EUVD) identifier?: Yes. CVE-2026-5223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31658.
When was CVE-2026-5223 published?: CVE-2026-5223 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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