CVE-2018-20225

highCVSS 7.8covered by 1 sourcefirst seen 2026-08-06

CSIRTS triage

vendor: pip product: pipSupply chainaffected: all versions

What: pip's --extra-index-url option allows installation of packages from unintended sources when a higher version number exists on a public index.
Who is affected: All pip users relying on private package indexes with the --extra-index-url flag.
Urgency: High severity (CVSS 7.8) supply chain risk; attackers can inject malicious packages of higher version numbers.
Action: Upgrade pip to a patched version that prioritizes private index packages correctly, or avoid --extra-index-url in favor of configuration-based index priority.

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Moderate exploitation risk1.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 76% of all EPSS-scored CVEs.

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