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CVE-2023-27043 medium CVSS 5.3

Vulnerability in libpython (CVE-2023-27043)

Summary

Vulnerability in libpython (CVE-2023-27043). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2023-27043 has been found in libpython.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade libpython to 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 or later.
If unsure, ask your IT team or search "libpython CVE-2023-27043" on the vendor's site.

CVE-2023-27043 (libpython) — CWE-20 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-20) exists in libpython.

📍 Affected scope

Check the vendor advisory for the affected versions of libpython.

🔥 Severity

Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'libpython' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'libpython' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で libpython を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade libpython to 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20

    ステージング環境で 3.8.20, 3.10.15, 3.11.10, 3.12.6, 3.9.20 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Bitnami libpython
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.8.20"},{"introduced":"3.10.0"},{"fixed":"3.10.15"},{"introduced":"3.11.0"},{"fixed":"3.11.10"},{"introduced":"3.12.0"},{"fixed":"3.12.6"},{"introduced":"3.9.0"},{"fixed":"3.9.20"}]}]
Bitnami python-min
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.8.20"},{"introduced":"3.10.0"},{"fixed":"3.10.15"},{"introduced":"3.11.0"},{"fixed":"3.11.10"},{"introduced":"3.12.0"},{"fixed":"3.12.6"},{"introduced":"3.9.0"},{"fixed":"3.9.20"}]}]
Bitnami python
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.8.20"},{"introduced":"3.10.0"},{"fixed":"3.10.15"},{"introduced":"3.11.0"},{"fixed":"3.11.10"},{"introduced":"3.12.0"},{"fixed":"3.12.6"},{"introduced":"3.9.0"},{"fixed":"3.9.20"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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