Sourced from pypdf's releases.

Version 6.6.0, 2026-01-09

What's new

Security (SEC)

• Improve handling of partially broken PDF files (#3594) by @​stefan6419846

Deprecations (DEP)

• Block common page content modifications when assigned to reader (#3582) by @​stefan6419846

New Features (ENH)

• Embellishments to generated text appearance streams (#3571) by @​PJBrs

Bug Fixes (BUG)

• Do not consider multi-byte BOM-like sequences as BOMs (#3589) by @​stefan6419846

Robustness (ROB)

• Avoid empty FlateDecode outputs without warning (#3579) by @​stefan6419846

Documentation (DOC)

• Add outlines documentation and link it in User Guide (#3511) by @​mainuddin-md

Developer Experience (DEV)

• Add PyPy 3.11 to test matrix and benchmarks (#3574) by @​rassie

Maintenance (MAINT)

• Fix compatibility with Pillow >= 12.1.0 (#3590) by @​stefan6419846

Full Changelog

Version 6.5.0, 2025-12-21

What's new

New Features (ENH)

• Limit jbig2dec memory usage (#3576) by @​stefan6419846
• FontDescriptor: Initiate from embedded font resource (#3551) by @​PJBrs

Robustness (ROB)

• Allow fallback to PBM files for jbig2dec without PNG support (#3567) by @​stefan6419846
• Use warning instead of error for early EOD for RunLengthDecode (#3548) by @​stefan6419846

Developer Experience (DEV)

• Test with macOS as well (#3401) by @​stefan6419846

Full Changelog

Sourced from pypdf's changelog.

Version 6.6.0, 2026-01-09

Security (SEC)

• Improve handling of partially broken PDF files (#3594)

Deprecations (DEP)

• Block common page content modifications when assigned to reader (#3582)

New Features (ENH)

• Embellishments to generated text appearance streams (#3571)

Bug Fixes (BUG)

• Do not consider multi-byte BOM-like sequences as BOMs (#3589)

Robustness (ROB)

• Avoid empty FlateDecode outputs without warning (#3579)

Documentation (DOC)

• Add outlines documentation and link it in User Guide (#3511)

Developer Experience (DEV)

• Add PyPy 3.11 to test matrix and benchmarks (#3574)

Maintenance (MAINT)

• Fix compatibility with Pillow >= 12.1.0 (#3590)

Full Changelog

Version 6.5.0, 2025-12-21

New Features (ENH)

• Limit jbig2dec memory usage (#3576)
• FontDescriptor: Initiate from embedded font resource (#3551)

Robustness (ROB)

• Allow fallback to PBM files for jbig2dec without PNG support (#3567)
• Use warning instead of error for early EOD for RunLengthDecode (#3548)

Developer Experience (DEV)

• Test with macOS as well (#3401)

Full Changelog

• 10df9c7 REL: 6.6.0
• 2941657 SEC: Improve handling of partially broken PDF files (#3594)
• 7126880 DEV: Update to urllib3 2.6.3 (#3593)
• f189f07 DOC: Add outlines documentation and link it in User Guide (#3511)
• a29e532 BUG: Do not consider multi-byte BOM-like sequences as BOMs (#3589)
• d9ce594 MAINT: Converge on one shared Font class for text extraction and appearance s...
• a65708c DEV: Check for JavaScript library updates on GitHub Pages (#3592)
• 6951bb7 MAINT: Fix compatibility with Pillow >= 12.1.0 (#3590)
• 97d47a0 TST: Improve test coverage (#3584)
• bda80a4 DEV: Add PyPy 3.11 to test matrix and benchmarks (#3574)
• Additional commits viewable in compare view

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