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

CVE-2026-5223 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-5223, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-5223
- Priority: Routine
- CVSS: 5.3 (Low)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 25, 2026
- Weakness: UNIX Symbolic Link (Symlink) Following
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5223

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rust-cargo Debian 14 | 0.91.0-3 | [DEBIAN-CVE-2026-5223](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5223.md) | May 25, 2026 |
| Linux | rustc Debian 13.5 (trixie) | 1.85.1+dfsg1-1+deb13u1 | [DEBIAN-CVE-2026-5223](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5223.md) | May 25, 2026 |
| Linux | rustc Debian 14 | 1.95.0+dfsg1-2 | [DEBIAN-CVE-2026-5223](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5223.md) | May 25, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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