Medium 6.5Published May 25, 2026

CVE-2026-5222Cargo between 1.68 and 1.96 incorrectly normalized the URLs of third-party registries using the sparse index protocol.

Updated under an hour ago (2026-10-19 06:20 UTC)

Does this affect you?

It affects rust-lang cargo. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for rust-lang cargo

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-647
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rust-lang cargo rust-lang:cargo	from 1.68.0 before 1.96.0	NVD

References

https://blog.rust-lang.org/2026/05/25/cve-2026-5222/vendor-advisory
https://github.com/rust-lang/cargo/pull/17031issue-tracking, patch
https://groups.google.com/g/rustlang-security-announcements/c/SfUxOiIdY5smailing-list, third-party-advisory

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.