{"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":"2026-04-29T15:30:58.707Z"},"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 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."}],"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":"2026-04-29T15:30:58.707Z"},"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/"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53"},{"tags":["patch"],"url":"https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4"}],"source":{"discovery":"UNKNOWN"},"title":"Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()","x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-14T13:43:47.712946Z","id":"CVE-2026-4786","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-14T13:43:54.704Z"}}]}}