Medium 6.5Published May 25, 2026

CVE-2026-5223Crates in third party registries can override the cached source of other crates

Updated under an hour ago (Oct 26, 2026, 11:10 AM ET)

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It affects Rust Project Cargo and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Rust Project Cargo

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
Weakness (CWE): CWE-61
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: rust
NVD analysis: Analyzed
Record last updated: May 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Rust Project Cargo rust_project:cargo (from the name)	from 1.0.0 before 1.96.0	CNA record
rust-lang cargo rust-lang:cargo	before 1.96.0	NVD

References

https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8vendor-advisory, mailing-list, third-party-advisory
https://blog.rust-lang.org/2026/05/25/cve-2026-5223/vendor-advisory, mitigation
https://github.com/rust-lang/cargo/pull/17031patch, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.