Version 6.16.0, 2026-08-13

What's new

Security (SEC)

• Detect cycles in TreeObject.insert_child (#3964) by @stefan6419846

New Features (ENH)

• AppearanceStream: Allow arbitrary rotations and apply rotations for annotation appearance streams (#3917) by @PJBrs
• AppearanceStream: Consider more encodings for Type1 core fonts (#3905) by @PJBrs

Performance Improvements (PI)

• Build /ToUnicode source-code bytes directly in parse_bfrange (#3952) by @Anai-Guo

Bug Fixes (BUG)

• Preserve internal Link annotations when appending/merging (#3953) (#3954) by @Anai-Guo
• Fix false inline image end markers (#3922) by @ciphercom
• Reject typeless non-page /Kids entries in strict mode (#3955) by @Anai-Guo
• Apply character spacing (Tc) per glyph in layout-mode extraction (#3951) by @Anai-Guo
• Keep the Adobe CMYK inversion when an explicit /Decode is present (#3943) by @RavSinghChandan

Robustness (ROB)

• AppearanceStream: Only escape parentheses for 8-bit fonts (#3961) by @PJBrs
• Recover the trailer from a cross-reference stream when rebuilding the xref (#3950) by @Anai-Guo

Maintenance (MAINT)

• Deduplicate CatalogAttributes and CatalogDictionary (#3940) by @j-t-1

Code Style (STY)

• Type pages as a Sequence rather than a list (#3957) by @RavSinghChandan

Full Changelog