Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2025-10-14 09:24

Modified

2025-10-14 09:53

Summary

Buffer overread when using an empty list with SSLContext.set_npn_protocols()

Details

CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "libpython",
        "purl": "pkg:bitnami/libpython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.24"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-5642"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "CPython 3.9 and earlier doesn\u0027t disallow configuring an empty list (\"[]\") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).",
  "id": "BIT-libpython-2024-5642",
  "modified": "2025-10-14T09:53:39.450Z",
  "published": "2025-10-14T09:24:35.254Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/06/28/4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/121227"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/23014"
    },
    {
      "type": "WEB",
      "url": "https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-5642"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240726-0005/"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Buffer overread when using an empty list with SSLContext.set_npn_protocols()"
}

CVE-2024-5642 (GCVE-0-2024-5642)

Vulnerability from cvelistv5 – Published: 2024-06-27 21:05 – Updated: 2026-07-31 14:06

Title

Buffer overread when using an empty list with SSLContext.set_npn_protocols()

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-28 13:47 UTC

CWE

CWE-noinfo Not enough information

Assigner

PSF mitre root

References

8 references

URL	Tags
https://jbp.io/2024/06/27/cve-2024-5535-openssl-m…	third-party-advisory
https://github.com/python/cpython/pull/23014	mitigation
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/commit/39258d35…	patch
http://www.openwall.com/lists/oss-security/2024/06/28/4
https://github.com/python/cpython/issues/121227	issue-tracking
https://security.netapp.com/advisory/ntap-2024072…
https://github.com/python/cpython/commit/a2cdbb6e…	patch

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.9.24 (python) Affected: 3.10.0a1 , < 3.10.0b1 (python)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerability from bitnami_vulndb

CVE-2024-5642 (GCVE-0-2024-5642)

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