AIKIDO-2026-860082
pypdf is vulnerable to Denial of Service (DoS)
50
Medium Risk
This Affects:
pypdfTL;DR
pypdf walks the document outline (bookmark) tree in _get_outline() without bounding depth or entry count. A crafted PDF with a huge outline, deeply nested items, or reused nesting paths forces long runtimes and large memory use when code reads reader.outline. The fix caps traversal at OUTLINE_MAX_DEPTH (100) and OUTLINE_MAX_ENTRIES (100,000) and raises LimitReachedError when those limits are exceeded.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application reads outlines or bookmarks from untrusted PDF files.
Background info
pypdf is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 6.16.0.
How to fix this
Upgrade the pypdf library to the patch version.
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SOC 2Compliant
ISO 27001Compliant