CVE-2023-27043

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2023-04-19. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 3%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
5.3
EG Score
5.3(medium)
EPSS
83.0%
KEV
Not listed

Published

April 19, 2023

Last Modified

May 12, 2026

References (69)

Vendor Advisories for CVE-2023-27043(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython2.7-minimal (2.7.12-1ubuntu0~16.04.18+esm18) @ xenial2026-05-22ubuntu
ubuntupython3.12-venv (3.12.3-1ubuntu0.2) @ noble2026-05-22ubuntu
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.4~14.04.1+esm3) @ trusty2026-05-22ubuntu
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.13+esm15) @ xenial2026-05-22ubuntu
redhatpython3.11-0:3.11.7-1.el82024-05-22redhat
redhatpython39-devel:3.9-8100020240214182535.7044f6c12024-05-22redhat
redhatpython3.11-0:3.11.7-1.el92024-04-30redhat
redhatodf4/rook-ceph-rhel9-operator:v4.15.0-1032024-03-19redhat
redhatpython3-0:3.6.8-51.el8_8.42024-01-30redhat
redhatpython3-0:3.6.8-47.el8_6.42024-01-25redhat
redhatpython3.9-0:3.9.18-1.el9_3.12024-01-25redhat
redhatpython3.9-0:3.9.16-1.el9_2.32024-01-25redhat
redhatpython3-0:3.6.8-56.el8_9.32024-01-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(12)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-07-11 12:41 UTCOSV refresh
  2. 2026-07-11 08:25 UTCEPSS rescore
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  1. 2026-06-23 21:31 UTCEPSS rescore
  2. 2026-06-22 19:05 UTCOSV refresh
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  65. 2026-05-22 06:26 UTCEG score recompute
  66. 2026-05-22 06:26 UTCVendor advisory
  67. 2026-05-22 06:26 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2023-27043?
CVE-2023-27043 is a medium vulnerability published on April 19, 2023. 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…
When was CVE-2023-27043 disclosed?
CVE-2023-27043 was first published in the National Vulnerability Database on April 19, 2023, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-27043 actively exploited?
CVE-2023-27043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-27043?
CVE-2023-27043 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-27043?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-27043, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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