Sourced from pypdf's releases.

Version 6.6.2, 2026-01-26

What's new

Security (SEC)

• Detect cyclic references when retrieving outlines (#3610) by @​stefan6419846

Full Changelog

Version 6.6.1, 2026-01-25

What's new

Robustness (ROB)

• /AcroForm might be NullObject (#3601) by @​joshkersey
• Handle missing font bounding boxes gracefully (#3600) by @​LudovA

Full Changelog

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)

... (truncated)

Sourced from pypdf's changelog.

Version 6.6.2, 2026-01-26

Security (SEC)

• Detect cyclic references when retrieving outlines (#3610)

Full Changelog

Version 6.6.1, 2026-01-25

Robustness (ROB)

• /AcroForm might be NullObject (#3601)
• Handle missing font bounding boxes gracefully (#3600)

Full 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)

... (truncated)

• ad47d50 REL: 6.6.2
• b1282f8 SEC: Detect cyclic references when retrieving outlines (#3610)
• f18e13c REL: 6.6.1
• 1973576 DEV: Bump wheel from 0.44.0 to 0.46.2 (#3608)
• 4740225 ROB: /AcroForm might be NullObject (#3601)
• 26fd638 ROB: Handle missing font bounding boxes gracefully (#3600)
• affe8ed DEV: Bump virtualenv from 20.27.0 to 20.36.1 (#3597)
• df1b91d DEV: Add missing dependency to URL check
• 10df9c7 REL: 6.6.0
• 2941657 SEC: Improve handling of partially broken PDF files (#3594)
• Additional commits viewable in compare view

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