{"id":"CVE-2023-27043","details":"The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.","aliases":["BIT-libpython-2023-27043","BIT-python-2023-27043","BIT-python-min-2023-27043","PSF-2023-2"],"modified":"2026-09-04T11:30:16.364550654Z","published":"2023-04-18T00:00:00Z","related":["ALSA-2024:0256","ALSA-2024:0466","ALSA-2024:2292","ALSA-2024:2985","ALSA-2024:3062","SUSE-SU-2023:4220-1","SUSE-SU-2024:0329-1","SUSE-SU-2024:0329-2","SUSE-SU-2024:0436-1","SUSE-SU-2024:0437-1","SUSE-SU-2024:0438-1","SUSE-SU-2024:0464-1","SUSE-SU-2024:0581-1","SUSE-SU-2024:0595-1","SUSE-SU-2024:0782-1","SUSE-SU-2024:0782-2","SUSE-SU-2024:0784-1","SUSE-SU-2024:1667-1","SUSE-SU-2024:1862-1","SUSE-SU-2024:2982-1","SUSE-SU-2025:20154-1","SUSE-SU-2025:20374-1","openSUSE-SU-2024:13049-1","openSUSE-SU-2024:13066-1","openSUSE-SU-2024:13085-1","openSUSE-SU-2024:13099-1","openSUSE-SU-2024:13104-1","openSUSE-SU-2024:13135-1","openSUSE-SU-2024:14109-1","openSUSE-SU-2024:14434-1","openSUSE-SU-2025:15713-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/27xxx/CVE-2023-27043.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"http://python.org"},{"type":"WEB","url":"http://seclists.org/fulldisclosure/2025/Apr/8"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-202008.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-577017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BQAKLUJMHFGVBRDPEY57BJGNCE5UUPHW/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6M5I6OQHJABNEYY555HUMMKX3Y4P25Z/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ORLXS5YTKN65E2Q2NWKXMFS5FWQHRNZW/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P2W2BZQIHMCKRI5FNBJERFYMS5PK6TAH/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PU6Y2S5CBN5BWCBDAJFTGIBZLK3S2G3J/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RDDC2VOX7OQC6OHMYTVD4HLFZIV6PYBC/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XWMBD4LNHWEXRI6YVFWJMTJQUL5WOFTS/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/"},{"type":"WEB","url":"https://python-security.readthedocs.io/vuln/email-parseaddr-realname.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/27xxx/CVE-2023-27043.json"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/"},{"type":"ADVISORY","url":"https://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