# CVE-2023-27043: Security feature bypass in n/a > Attackers can bypass email domain verification checks by exploiting incorrect address parsing in the Python email module. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 18 Apr 2023 - **Updated:** 12 May 2026 - **Also known as:** ALPINE-CVE-2023-27043, ALSA-2024:0256, ALSA-2024:0466, ALSA-2024:2292, ALSA-2024:3062, AZL-109662, AZL-31167, AZL-35144, BELL-CVE-2023-27043, BIT-libpython-2023-27043, BIT-python-2023-27043, BIT-python-min-2023-27043, CLEANSTART-2026-TC99018, CLSA-2024-1711491407, CLSA-2024-1711648611, CLSA-2024-1717692075, CLSA-2024-1717693264, CLSA-2024-1725382525, CLSA-2024-1725544866, CLSA-2024-1726314076, CLSA-2024-1729627193, CLSA-2024-1729627400, CLSA-2024-1729628050, CLSA-2024-1730133909, CLSA-2025-1740645491, DEBIAN-CVE-2023-27043, GHSA-5mwm-wccq-xqcp, OESA-2024-2354, OESA-2024-2420, OESA-2024-2421, PSF-2023-2, RHSA-2024:0256, RHSA-2024:0454, RHSA-2024:0466, RHSA-2024:2292, RHSA-2024:3062, RLSA-2024:0256, RLSA-2024:3062, 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-2024:0581-1, SUSE-SU-2024:0595-1, UBUNTU-CVE-2023-27043, USN-7015-3, USN-7015-4, USN-7015-7, 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 ## What is CVE-2023-27043? CVE-2023-27043 is a medium-severity vulnerability in Fedoraproject Fedora, published on 18 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official 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. Weakness: CWE-20 (Improper Input Validation), CWE-1286 (Improper Validation of Syntactic Correctness of Input) ## Which versions are affected by CVE-2023-27043? 3 open source packages ship an affected version, including libpython, python and python-min. It affects 4 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libpython` | Bitnami | All versions | 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 | | `python` | Bitnami | All versions | 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 | | `python-min` | Bitnami | All versions | 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 | | `platform-python` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `platform-python-debug` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `platform-python-devel` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `python3-idle` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `python3-libs` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `python3-test` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `python3-tkinter` | AlmaLinux:8 | All versions | 3.6.8-56.el8_9.3.alma.1 | | `python3.11` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-debug` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-devel` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-idle` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-libs` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-rpm-macros` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-test` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python3.11-tkinter` | AlmaLinux:8 | All versions | 3.11.7-1.el8 | | `python-unversioned-command` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-debug` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-devel` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-idle` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-libs` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-test` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3-tkinter` | AlmaLinux:9 | All versions | 3.9.18-1.el9_3.1 | | `python3.11` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-debug` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-devel` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-idle` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-libs` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-test` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `python3.11-tkinter` | AlmaLinux:9 | All versions | 3.11.7-1.el9 | | `platform-python` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `platform-python-debug` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `platform-python-devel` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `python3-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `python3-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `python3-idle` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | | `python3-test` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-56.el8_9.3 | Products: Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Ontap Select Deploy Administration Utility, Python Python. ## How do I fix CVE-2023-27043? Upgrade libpython to a fixed version for your release line: 3.8.20, 3.10.15, 3.11.10 or 3.12.6. ## Is CVE-2023-27043 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27043 exists. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-27043 and fix it if it is affected. What it is: CVE-2023-27043 is a medium-severity vulnerability in Fedoraproject Fedora, published on 18 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-27043 exists. Affected packages and fixed versions: - libpython (Bitnami): affected all versions; fixed in 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 - python (Bitnami): affected all versions; fixed in 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 - python-min (Bitnami): affected all versions; fixed in 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-27043/ (Markdown: https://insights.sbomify.com/CVE-2023-27043/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-27043 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-27043 - OSV: https://osv.dev/vulnerability/CVE-2023-27043 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-27043/ Summaries are generated and may contain mistakes; the official description above is the record.