What is CVE-2026-5223?

CVE-2026-5223 is a medium-severity vulnerability in Rust-lang Cargo, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 5.3/10. Published 2026-05-25.

How severe is CVE-2026-5223?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Rust-lang Cargo

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 **medi…

EPSS: 0.001 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Rust-lang Cargo
Rust Project Cargo — versions 1.0.0

Weakness classification (CWE)

CWE-61 — UNIX Symbolic Link (Symlink) Following

References

986d4109-89ea-491f-99fd-a8e4803919bd (mailing-list, vendor-advisory, Mailing List, Third Party Advisory)
986d4109-89ea-491f-99fd-a8e4803919bd (vendor-advisory, Mitigation, Vendor Advisory)
986d4109-89ea-491f-99fd-a8e4803919bd (Patch, patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5223?: CVE-2026-5223 is a medium-severity vulnerability in Rust-lang Cargo, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 5.3/10. Published 2026-05-25.
How severe is CVE-2026-5223?: Medium severity. CVSS v3 base score is 5.3 out of 10.