CVE-2026-4786

{"id": "CVE-2026-4786", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "cna@python.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.0, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-04-13T22:16:30.413", "references": [{"url": "https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/issues/148169", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/pull/148170", "source": "cna@python.org"}, {"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/", "source": "cna@python.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cna@python.org", "description": [{"lang": "en", "value": "CWE-77"}]}], "descriptions": [{"lang": "en", "value": "Mitgation of\u00a0CVE-2026-4519 was incomplete. If the URL contained \"%action\" the mitigation could be bypassed for certain browser types the \"webbrowser.open()\" API could have commands injected into the underlying shell. See\u00a0CVE-2026-4519 for details."}], "lastModified": "2026-04-29T16:16:26.123", "sourceIdentifier": "cna@python.org"}