CVE-2023-27043

medium

Description

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.

References

Advisories
More

https://security.netapp.com/advisory/ntap-20230601-0003/

https://lists.fedoraproject.org/archives/list/[email protected]/message/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/

https://lists.fedoraproject.org/archives/list/[email protected]/message/XWMBD4LNHWEXRI6YVFWJMTJQUL5WOFTS/

https://lists.fedoraproject.org/archives/list/[email protected]/message/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/

https://lists.fedoraproject.org/archives/list/[email protected]/message/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/

https://lists.fedoraproject.org/archives/list/[email protected]/message/RDDC2VOX7OQC6OHMYTVD4HLFZIV6PYBC/

https://lists.fedoraproject.org/archives/list/[email protected]/message/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/

https://lists.fedoraproject.org/archives/list/[email protected]/message/PU6Y2S5CBN5BWCBDAJFTGIBZLK3S2G3J/

https://lists.fedoraproject.org/archives/list/[email protected]/message/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/

https://lists.fedoraproject.org/archives/list/[email protected]/message/P2W2BZQIHMCKRI5FNBJERFYMS5PK6TAH/

https://lists.fedoraproject.org/archives/list/[email protected]/message/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/

https://lists.fedoraproject.org/archives/list/[email protected]/message/ORLXS5YTKN65E2Q2NWKXMFS5FWQHRNZW/

https://lists.fedoraproject.org/archives/list/[email protected]/message/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/

https://lists.fedoraproject.org/archives/list/[email protected]/message/N6M5I6OQHJABNEYY555HUMMKX3Y4P25Z/

https://lists.fedoraproject.org/archives/list/[email protected]/message/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/

https://lists.fedoraproject.org/archives/list/[email protected]/message/BQAKLUJMHFGVBRDPEY57BJGNCE5UUPHW/

https://lists.fedoraproject.org/archives/list/[email protected]/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/

https://lists.fedoraproject.org/archives/list/[email protected]/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/

https://lists.fedoraproject.org/archives/list/[email protected]/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWMBD4LNHWEXRI6YVFWJMTJQUL5WOFTS/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SOX7BCN6YL7B3RFPEEXPIU5CMTEHJOKR/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDC2VOX7OQC6OHMYTVD4HLFZIV6PYBC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PU6Y2S5CBN5BWCBDAJFTGIBZLK3S2G3J/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2W2BZQIHMCKRI5FNBJERFYMS5PK6TAH/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORLXS5YTKN65E2Q2NWKXMFS5FWQHRNZW/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6M5I6OQHJABNEYY555HUMMKX3Y4P25Z/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BQAKLUJMHFGVBRDPEY57BJGNCE5UUPHW/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/

https://cert-portal.siemens.com/productcert/html/ssa-577017.html

https://python-security.readthedocs.io/vuln/email-parseaddr-realname.html

https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html

https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html

https://github.com/python/cpython/issues/102988

https://cert-portal.siemens.com/productcert/html/ssa-202008.html

http://seclists.org/fulldisclosure/2025/Apr/8

http://python.org

Details

Source: Mitre, NVD

Published: 2023-04-19

Updated: 2026-05-12

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.00716