CVE-2023-27043

    Dashboard / Vulnerabilities / CVE-2023-27043

    CVE-2023-27043

    Published: 18 Apr 2023Last Modified: 12 Aug 2026

    Summary:

    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.

    References: http://python.org, http://seclists.org/fulldisclosure/2025/Apr/8, https://cert-portal.siemens.com/productcert/html/ssa-202008.html, https://cert-portal.siemens.com/productcert/html/ssa-577017.html, https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html, https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html, https://lists.fedoraproject.org/archives/list/[email protected]/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/, https://lists.fedoraproject.org/archives/list/[email protected]/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/, https://lists.fedoraproject.org/archives/list/[email protected]/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/, https://lists.fedoraproject.org/archives/list/[email protected]/message/BQAKLUJMHFGVBRDPEY57BJGNCE5UUPHW/, https://lists.fedoraproject.org/archives/list/[email protected]/message/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/, https://lists.fedoraproject.org/archives/list/[email protected]/message/N6M5I6OQHJABNEYY555HUMMKX3Y4P25Z/, https://lists.fedoraproject.org/archives/list/[email protected]/message/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/, https://lists.fedoraproject.org/archives/list/[email protected]/message/ORLXS5YTKN65E2Q2NWKXMFS5FWQHRNZW/, https://lists.fedoraproject.org/archives/list/[email protected]/message/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/, https://lists.fedoraproject.org/archives/list/[email protected]/message/P2W2BZQIHMCKRI5FNBJERFYMS5PK6TAH/, https://lists.fedoraproject.org/archives/list/[email protected]/message/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/, https://lists.fedoraproject.org/archives/list/[email protected]/message/PU6Y2S5CBN5BWCBDAJFTGIBZLK3S2G3J/, https://lists.fedoraproject.org/archives/list/[email protected]/message/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/, https://lists.fedoraproject.org/archives/list/[email protected]/message/RDDC2VOX7OQC6OHMYTVD4HLFZIV6PYBC/, https://lists.fedoraproject.org/archives/list/[email protected]/message/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/, https://lists.fedoraproject.org/archives/list/[email protected]/message/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/, https://lists.fedoraproject.org/archives/list/[email protected]/message/XWMBD4LNHWEXRI6YVFWJMTJQUL5WOFTS/, https://lists.fedoraproject.org/archives/list/[email protected]/message/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/, https://python-security.readthedocs.io/vuln/email-parseaddr-realname.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/27xxx/CVE-2023-27043.json, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/, 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/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/, 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/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/, 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/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/, 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/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/, 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/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/, 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/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/, 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/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/, 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/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/, 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/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/, https://nvd.nist.gov/vuln/detail/CVE-2023-27043, https://security.netapp.com/advisory/ntap-20230601-0003/, https://github.com/python/cpython/issues/102988

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v3.12.5
    v3.12.4
    v3.12.3
    v3.12.2
    v3.12.1
    v3.12.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2023-27043 | CVE-DB