{"id":"CVE-2026-4786","summary":"Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()","details":"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.","aliases":["BIT-libpython-2026-4786","BIT-python-2026-4786","BIT-python-min-2026-4786","PSF-0000-CVE-2026-4786","PSF-2026-17"],"modified":"2026-06-17T04:02:23.143240258Z","published":"2026-04-13T21:52:19.036Z","related":["ALSA-2026:10711","ALSA-2026:10745","ALSA-2026:10774","ALSA-2026:10949","ALSA-2026:10950","ALSA-2026:11062","ALSA-2026:11077","ALSA-2026:19019","ALSA-2026:19064","ALSA-2026:19175","ALSA-2026:19176","ALSA-2026:19177","ALSA-2026:19216","CGA-3hm5-gv2v-vgw8","SUSE-SU-2026:1715-1","SUSE-SU-2026:1818-1","SUSE-SU-2026:1937-1","SUSE-SU-2026:1947-1","SUSE-SU-2026:2055-1","SUSE-SU-2026:2387-1","openSUSE-SU-2026:10647-1","openSUSE-SU-2026:10648-1","openSUSE-SU-2026:10667-1"],"database_specific":{"cna_assigner":"PSF","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4786.json","cwe_ids":["CWE-77"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4786.json"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4786"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/148169"},{"type":"FIX","url":"https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53"},{"type":"FIX","url":"https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca"},{"type":"FIX","url":"https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff"},{"type":"FIX","url":"https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4"},{"type":"FIX","url":"https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769"},{"type":"FIX","url":"https://github.com/python/cpython/pull/148170"},{"type":"PACKAGE","url":"https://github.com/python/cpython"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"introduced":"b092705907c758d4f9742028652c9802f9f03dd3"},{"introduced":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"},{"fixed":"a68a9190498a16ab1a5c9012ef5a70df81a5b328"},{"fixed":"f31a89bb901067dd105b00cfa90523cf7ffdbbdd"},{"fixed":"28b4ad38067bbdad34edfcd03ad2de5f06387e53"},{"fixed":"c5767a72838a8dda9d6dc5d3558075b055c56bca"},{"fixed":"d22922c8a7958353689dc4763dd72da2dea03fff"},{"fixed":"d6d68494be70bdbda20f89f83801ba52ec37daa4"},{"fixed":"f4654824ae0850ac87227fb270f9057477946769"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"3.13.14"},{"introduced":"3.14.0a1"},{"fixed":"3.14.5rc1"},{"introduced":"3.15.0a1"},{"fixed":"3.15.0b1"}]}}],"versions":["v3.13.13","v3.14.4","v3.15.0a8","v3.15.0a7","v3.10.20","v3.11.15","v3.15.0a6","v3.13.12","v3.14.3","v3.15.0a5","v3.15.0a4","v3.15.0a3","v3.14.2","v3.13.11","v3.13.10","v3.14.1","v3.15.0a2","v3.15.0a1","v3.13.8","v3.11.14","v3.10.19","v3.14.0","v3.14.0rc3","v3.13.7","v3.14.0rc2","v3.13.6","v3.14.0rc1","v3.14.0b4","v3.14.0b3","v3.13.5","v3.13.4","v3.11.13","v3.10.18","v3.14.0b2","v3.14.0b1","v3.13.3","v3.11.12","v3.10.17","v3.13.2","v3.13.1","v3.10.16","v3.11.11","v3.13.0","v3.13.0rc3","v3.11.10","v3.10.15","v3.13.0rc2","v3.13.0rc1","v3.13.0b4","v3.13.0b3","v3.13.0b2","v3.13.0b1","v3.13.0a6","v3.11.9","v3.10.14","v3.13.0a5","v3.13.0a4","v3.11.8","v3.13.0a3","v3.11.7","v3.13.0a2","v3.13.0a1","v3.11.6","v3.11.5","v3.10.13","v3.11.4","v3.10.12","v3.12.0b1","v3.10.11","v3.11.3","v3.12.0a7","v3.12.0a6","v3.10.10","v3.11.2","v3.12.0a5","v3.12.0a4","v3.12.0a3","v3.10.9","v3.11.1","v3.12.0a2","v3.12.0a1","v3.11.0rc2","v3.10.8","v3.10.7","v3.11.0rc1","v3.10.6","v3.11.0b5","v3.11.0b4","v3.10.5","v3.11.0b3","v3.11.0b2","v3.11.0b1","v3.11.0a7","v3.10.4","v3.10.3","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.10.2","v3.11.0a3","v3.10.1","v3.10.0rc2","v3.10.0rc1","v3.10.0b4","v3.10.0b3","v3.10.0b2","v3.10.0b1","v3.10.0a7","v3.10.0a1","v3.9.0a2","v3.7.0a2","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1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