CVE-2023-27043: fedoraproject fedora Improper Input Validation
Vulnerability summary
CVE-2023-27043 is a medium (CVSS 5.3) Improper Input Validation vulnerability in fedoraproject fedora. EPSS estimates a 2.53% chance of exploitation in the next 30 days, higher than 84.9% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 19 · Related 19Timeline
- 18-04-2023PublishedVulnerability first disclosed.
- 12-05-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
8 scores · 8 sources · 1 version- OSV · AlpineEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · Red hatEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · WolfiEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · ChainguardEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
2.53%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.53% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundCpython
Maturity: poc
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-1286Improper Validation of Syntactic Correctness of InputThe product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse43 products
- python-base&distro=SUSE Linux Enterprise Module for Package Hub 15 SP4< 2.7.18-150000.60.1
- python-base&distro=SUSE Linux Enterprise Module for Package Hub 15 SP5< 2.7.18-150000.60.1
- python-base&distro=SUSE Linux Enterprise Server 12 SP5< 2.7.18-33.29.1
- python-base&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 2.7.18-33.29.1
- python-base&distro=SUSE Linux Enterprise Workstation Extension 12 SP5< 2.7.18-33.29.1
Redhat26 products
- platform-python< 0:3.6.8-56.el8_9.3
- platform-python-debug< 0:3.6.8-56.el8_9.3
- platform-python-devel< 0:3.6.8-56.el8_9.3
- python-unversioned-command< 0:3.9.16-1.el9_2.3 | < 0:3.9.18-1.el9_3.1
- python3< 0:3.6.8-56.el8_9.3 | < 0:3.9.16-1.el9_2.3 | < 0:3.9.18-1.el9_3.1
Opensuse19 products
- python-base&distro=openSUSE Leap 15.5< 2.7.18-150000.60.1
- python-doc&distro=openSUSE Leap 15.5< 2.7.18-150000.60.1
- python3-core&distro=openSUSE Leap 15.5< 3.6.15-150300.10.54.1
- python3-core&distro=openSUSE Leap Micro 5.3< 3.6.15-150300.10.54.1
- python3-core&distro=openSUSE Leap Micro 5.4< 3.6.15-150300.10.54.1
Ubuntu10 products
- python2.7< 2.7.12-1ubuntu0~16.04.18+esm11 | < 2.7.17-1~18.04ubuntu1.13+esm6 | < 2.7.18-1~20.04.4+esm3 | < 2.7.18-13ubuntu1.2+esm3 | < 2.7.6-8ubuntu0.6+esm20 | < 2.7.12-1ubuntu0~16.04.18+esm18 | < 2.7.17-1~18.04ubuntu1.13+esm13
- python3.10< 3.10.12-1~22.04.6
- python3.11All versions (No fix recorded)
- python3.12< 3.12.3-1ubuntu0.2
- python3.4All versions (No fix recorded)
Chainguard4 products
- conda< 25.3.0-r0
- python-3.10< 3.10.13-r5
- python-3.11< 3.11.8-r1
- python-3.9< 3.9.18-r4
Wolfi3 products
- conda< 25.3.0-r0
- python-3.10< 3.10.13-r5
- python-3.11< 3.11.8-r1
Debian2 products
- pypy3< 7.3.11+dfsg-2+deb12u3 | < 7.3.17+dfsg-3
- python3.11< 3.11.2-6+deb12u5
Netapp2 products
Alpine1 product
- python3< 3.10.15-r0 | < 3.11.10-r0 | < 3.12.6-r0
Fedoraproject1 product
- fedoraEOL38 | 39
Python1 product
- python≤ 2.7.18 | ≥ 3.0, < 3.8.20 | ≥ 3.9.0, < 3.9.20 | ≥ 3.10.0, < 3.10.15 | ≥ 3.11.0, < 3.11.10 | ≥ 3.12.0, < 3.12.6
11 vendors · 112 products
