pypdf 6.12.0

Version 6.12.0, 2026-05-21

on Python PyPI

What's new

Security (SEC)

• Disallow cross-reference streams with zero-only width values (#3791) by @stefan6419846
• Avoid excessive whitespace in layout mode text extraction (#3790) by @stefan6419846

New Features (ENH)

• Implement SASLprep (RFC 4013) for AES-256 password normalization (#3780) by @adityamoolya
• CID font resource from font file to encode more characters (#3652) by @PJBrs

Performance Improvements (PI)

• Optimize retrieval of named destinatinos in reader (#3442) by @larsga

Bug Fixes (BUG)

• Fix TreeObject.insert_child KeyError on fresh children (#3786) by @Abzaek

Robustness (ROB)

• AppearanceStream: Also honor user-set font name when not flattening annotations (#3781) by @PJBrs

Documentation (DOC)

• Block encrypting writer in incremental mode (#3789) by @stefan6419846

Full Changelog