Sourced from pyopenssl's changelog.

26.0.0 (2026-03-15)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Dropped support for Python 3.7.
• The minimum cryptography version is now 46.0.0.

Deprecations: ^^^^^^^^^^^^^

Changes: ^^^^^^^^

• Added support for using aws-lc instead of OpenSSL.
• Properly raise an error if a DTLS cookie callback returned a cookie longer than DTLS1_COOKIE_LENGTH bytes. Previously this would result in a buffer-overflow. Credit to dark_haxor for reporting the issue. CVE-2026-27459
• Added OpenSSL.SSL.Connection.get_group_name to determine which group name was negotiated.
• Context.set_tlsext_servername_callback now handles exceptions raised in the callback by calling sys.excepthook and returning a fatal TLS alert. Previously, exceptions were silently swallowed and the handshake would proceed as if the callback had succeeded. Credit to Leury Castillo for reporting this issue. CVE-2026-27448

25.3.0 (2025-09-16)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Deprecations: ^^^^^^^^^^^^^

Changes: ^^^^^^^^

• Maximum supported cryptography version is now 46.x.

25.2.0 (2025-09-14)

Backward-incompatible changes: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• The minimum cryptography version is now 45.0.7.

Deprecations: ^^^^^^^^^^^^^

Changes: ^^^^^^^^

• pyOpenSSL now sets SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER on connections by default, matching CPython's behavior.

... (truncated)

• 358cbf2 Prepare for 26.0.0 release (#1487)
• a8d28e7 Bump actions/cache from 4 to 5 (#1486)
• 6fefff0 Add aws-lc compatibility to tests and CI (#1476)
• a739f96 Bump actions/download-artifact from 8.0.0 to 8.0.1 (#1485)
• 8b4c66b Bump actions/upload-artifact in /.github/actions/upload-coverage (#1484)
• 02a5c78 Bump actions/upload-artifact from 6.0.0 to 7.0.0 (#1483)
• d973387 Bump actions/download-artifact from 7.0.0 to 8.0.0 (#1482)
• 57f09bb Fix buffer overflow in DTLS cookie generation callback (#1479)
• d41a814 Handle exceptions in set_tlsext_servername_callback callbacks (#1478)
• 7b29beb Fix not using a cryptography wheel on uv (#1475)
• Additional commits viewable in compare view

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