AIKIDO-2026-10937
pypdf is vulnerable to Denial of Service (DoS)
65
Medium Risk
This Affects:
pypdfTL;DR
Layout-mode text extraction in _fixed_width_page.py builds output by inserting padding spaces and blank lines from character position offsets in page content streams. A crafted PDF with extreme Tm horizontal displacements or large vertical gaps can make extract_text(extraction_mode="layout") allocate very large whitespace strings. Before the fix, extraction could consume substantial memory building the returned text. The fix caps intra-line whitespace padding and blank-line insertion at fixed limits and logs a warning when truncating.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
pypdf is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 6.11.0.
How to fix this
Upgrade the pypdf library to the patch version.
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SOC 2Compliant
ISO 27001Compliant