AIKIDO-2026-150856
pypdf is vulnerable to Denial of Service (DoS)
48
Medium Risk
This Affects:
pypdfTL;DR
pypdf parses /ToUnicode CMap streams when extracting text from a PDF. A crafted font can provide /ToUnicode entries with unusually large token values. Processing these entries consumes excessive memory while building the character map. The fix limits the token length accepted for /ToUnicode entries.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you extract text from PDF documents whose embedded fonts can carry an untrusted /ToUnicode CMap.
Background info
pypdf is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 6.14.2.
How to fix this
Upgrade the pypdf library to the patch version.
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