{"id":"CVE-2026-13346","aliases":["PYSEC-2026-3721","GHSA-qwm4-qh6w-59xr"],"title":"pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk e…","summary":"pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.\n\n\n\n\nThis vulnerability requires downloading or installing a package from…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","vendor":"pip","product":"pip","ecosystem":"pip","affected":["pip < 26.2"],"patched":["pip 26.2"],"published":"2026-07-29","updated":"2026-09-10","sourceUpdated":"2026-09-10T11:15:08.939447160Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3721","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/29/7"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/L2BNQGGVQCEV7DROOORQ7WFKKFF2OOQX/"},{"url":"https://github.com/pypa/pip/pull/14110"},{"url":"https://github.com/advisories/GHSA-qwm4-qh6w-59xr"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13346"},{"url":"https://github.com/pypa/pip/commit/10dfb6b9005484578b386f64b9f36982e3dc6679"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pip/PYSEC-2026-3721.yaml"},{"url":"https://github.com/pypa/pip"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/L2BNQGGVQCEV7DROOORQ7WFKKFF2OOQX"}],"tags":["osv","pip"],"epss":0.00292,"epssPercentile":0.22068,"ingestedAt":"2026-08-21T19:23:48.291Z","slug":"CVE-2026-13346","body":"## Overview\n\npip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.\n\n\n\n\nThis vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone are not able to exploit this vulnerability. Note that this vulnerability only materially impacts users running `pip download` with the `--only-binary` option as installing source distributions from an untrusted index is already an unsafe operation that executes code during install time.\n\n## Affected packages\n\n- `pip < 26.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `pip 26.2`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}