# What changed in pyopenssl

> 2 changes in pyopenssl 26 from its official release notes, upgrade guides and advisories: 2 security. Each one cited. Sources checked 2026-10-27. HTML: https://unstale.sh/pypi/pyopenssl/

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## pyopenssl 26

### Security

- pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback (26.0.0) — [security advisory](https://github.com/advisories/GHSA-VP96-HXJ8-P424)
- pyOpenSSL DTLS cookie callback buffer overflow (26.0.0) — [security advisory](https://github.com/advisories/GHSA-5PWR-322W-8JR4)