{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4786", "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22", "state": "PUBLISHED", "assignerShortName": "PSF", "dateReserved": "2026-03-24T19:25:48.269Z", "datePublished": "2026-04-13T21:52:19.036Z", "dateUpdated": "2026-04-13T21:56:25.643Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"lessThan": "3.15.0", "status": "affected", "version": "0", "versionType": "python"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "an7y"}, {"lang": "en", "type": "coordinator", "value": "Seth Larson"}, {"lang": "en", "type": "remediation developer", "value": "Stan Ulbrych"}], "descriptions": [{"lang": "en", "supportingMedia": [{"type": "text/html", "value": "Mitgation of CVE-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 CVE-2026-4519 for details."}], "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."}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 7, "baseSeverity": "HIGH", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-77", "description": "CWE-77", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "28c92f92-d60d-412d-b760-e73465c3df22", "shortName": "PSF", "dateUpdated": "2026-04-13T21:56:25.643Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/python/cpython/pull/148170"}, {"tags": ["issue-tracking"], "url": "https://github.com/python/cpython/issues/148169"}, {"tags": ["vendor-advisory"], "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/"}], "source": {"discovery": "UNKNOWN"}, "title": "Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()"}}}

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{"cveTags": [], "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."}], "id": "CVE-2026-4786", "lastModified": "2026-04-13T22:16:30.413", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@python.org", "type": "Secondary"}]}, "published": "2026-04-13T22:16:30.413", "references": [{"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/"}], "sourceIdentifier": "cna@python.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-77"}], "source": "cna@python.org", "type": "Secondary"}]}

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