# pyopenssl (PyPI) vulnerabilities

Source: https://junglewise.ai/threats/technologies/pypi-pyopenssl  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/pypi-pyopenssl.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in pyopenssl (PyPI): 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-27459, was published on 18 March 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 5 (1 critical, 0 exploited in the wild)

## About pyopenssl (PyPI)

Python wrapper for OpenSSL providing SSL/TLS protocol support and cryptographic functions.

## Latest pyopenssl (PyPI) vulnerabilities

- [CVE-2026-27459: pyOpenSSL buffer overflow in DTLS cookie generation callback](https://junglewise.ai/threats/cve-2026-27459-pyopenssl-buffer-overflow-in-dtls-cookie-generation-callback) (critical, CVSS 9.8, published 18 Mar 2026)
- [CVE-2026-27448: pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback](https://junglewise.ai/threats/cve-2026-27448-pyopenssl-allows-tls-connection-bypass-via-unhandled-callback) (medium, CVSS 4, published 18 Mar 2026)
- [CVE-2018-1000807: PyOpenSSL Use-After-Free vulnerability](https://junglewise.ai/threats/cve-2018-1000807-pyopenssl-use-after-free-vulnerability) (low, CVSS 3.1, published 8 Oct 2018)
- [CVE-2018-1000808: pyOpenSSL incorrect memory management in PKCS #12 handling](https://junglewise.ai/threats/cve-2018-1000808-pyopenssl-incorrect-memory-management-in-pkcs-12-handling) (low, CVSS 3, published 8 Oct 2018)
- [CVE-2013-4314: PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name](https://junglewise.ai/threats/cve-2013-4314-pyopenssl-mishandles-nul-byte-in-certificate-subject-alternative) (low, CVSS 3.1, published 30 Sep 2013)

## Most severe pyopenssl (PyPI) vulnerabilities

- [CVE-2026-27459: pyOpenSSL buffer overflow in DTLS cookie generation callback](https://junglewise.ai/threats/cve-2026-27459-pyopenssl-buffer-overflow-in-dtls-cookie-generation-callback) (critical, CVSS 9.8, published 18 Mar 2026)
- [CVE-2026-27448: pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback](https://junglewise.ai/threats/cve-2026-27448-pyopenssl-allows-tls-connection-bypass-via-unhandled-callback) (medium, CVSS 4, published 18 Mar 2026)
- [CVE-2018-1000807: PyOpenSSL Use-After-Free vulnerability](https://junglewise.ai/threats/cve-2018-1000807-pyopenssl-use-after-free-vulnerability) (low, CVSS 3.1, published 8 Oct 2018)
- [CVE-2013-4314: PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name](https://junglewise.ai/threats/cve-2013-4314-pyopenssl-mishandles-nul-byte-in-certificate-subject-alternative) (low, CVSS 3.1, published 30 Sep 2013)
- [CVE-2018-1000808: pyOpenSSL incorrect memory management in PKCS #12 handling](https://junglewise.ai/threats/cve-2018-1000808-pyopenssl-incorrect-memory-management-in-pkcs-12-handling) (low, CVSS 3, published 8 Oct 2018)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other PyPI technologies

- [tensorflow (PyPI)](https://junglewise.ai/threats/technologies/pypi-tensorflow): 435 vulnerabilities
- [tensorflow-cpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-cpu): 430 vulnerabilities
- [tensorflow-gpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-gpu): 427 vulnerabilities
- [open-webui (PyPI)](https://junglewise.ai/threats/technologies/open-webui): 177 vulnerabilities
- [Django (PyPI)](https://junglewise.ai/threats/technologies/django): 173 vulnerabilities
- [apache-airflow (PyPI)](https://junglewise.ai/threats/technologies/apache-airflow): 159 vulnerabilities
- [pillow (PyPI)](https://junglewise.ai/threats/technologies/pillow): 125 vulnerabilities
- [praisonai (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonai): 120 vulnerabilities
- [vllm (PyPI)](https://junglewise.ai/threats/technologies/pypi-vllm): 117 vulnerabilities
- [plone (PyPI)](https://junglewise.ai/threats/technologies/pypi-plone): 101 vulnerabilities
- [mlflow (PyPI)](https://junglewise.ai/threats/technologies/mlflow): 88 vulnerabilities
- [picklescan (PyPI)](https://junglewise.ai/threats/technologies/picklescan): 86 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "pyopenssl (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/pypi-pyopenssl, 13 November 2026.