Cargo crates in third party registries can override the cached source of other crates

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0029, the 22nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:18 UTC First seen by agentprime
2. 31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-jq42-7mfv-hm57
• OSV: GHSA-jq42-7mfv-hm57
• github.com/rust-lang/cargo/security/advisories/GHSA-jq42-7mfv-hm57
• nvd.nist.gov/vuln/detail/CVE-2026-5223
• github.com/rust-lang/cargo/pull/17031
• blog.rust-lang.org/2026/05/25/cve-2026-5223
• github.com/rust-lang/cargo
• groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.