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SEC: Limit FlateDecode recovery attempts#3644

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stefan6419846 merged 2 commits intopy-pdf:mainfrom
stefan6419846:zlib-recovery
Feb 17, 2026
Merged

SEC: Limit FlateDecode recovery attempts#3644
stefan6419846 merged 2 commits intopy-pdf:mainfrom
stefan6419846:zlib-recovery

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codecov bot commented Feb 17, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.36%. Comparing base (9cdcc4c) to head (f492f57).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #3644   +/-   ##
=======================================
  Coverage   97.36%   97.36%           
=======================================
  Files          55       55           
  Lines        9879     9884    +5     
  Branches     1807     1808    +1     
=======================================
+ Hits         9619     9624    +5     
  Misses        151      151           
  Partials      109      109           

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@stefan6419846 stefan6419846 merged commit 7905842 into py-pdf:main Feb 17, 2026
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@stefan6419846 stefan6419846 deleted the zlib-recovery branch February 17, 2026 16:38
stefan6419846 added a commit that referenced this pull request Feb 17, 2026
## What's new

### Security (SEC)
- Detect cyclic references when accessing TreeObject.children (#3645) by @stefan6419846
- Limit size of `/ToUnicode` entries (#3646) by @stefan6419846
- Limit FlateDecode recovery attempts (#3644) by @stefan6419846

### Bug Fixes (BUG)
- Avoid own object replacement logic in `PageObject.replace_contents` (#3638) by @stefan6419846
- Fix UnboundLocalError when update_page_form_field_values with /Sig (#3634) by @John-Sharp

### Robustness (ROB)
- Avoid divison by zero when decoding FlateDecode PNG prediction (#3641) by @stefan6419846

[Full Changelog](6.7.0...6.7.1)
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