Allocation of Resources Without Limits or Throttling Affecting pypdf package, versions [,6.18.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Oct 2026
- disclosed1 Oct 2026
- creditjungmingi-lab
Introduced: 1 Oct 2026
NewCVE-2026-102996 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.18.1 or higher.
Overview
pypdf is an A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via _collect_tt_t1_character_widths in pypdf/_font.py, where a PDF containing a TrueType or Type1 font with an oversized /Widths array causes unbounded iteration over all entries. An attacker can supply a malicious PDF with a /Widths array far exceeding the 256-entry maximum meaningful for simple fonts, triggering excessive resource consumption and crashing the process.