Infinite loop Affecting pypdf package, versions [,6.14.2)
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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Test your applications- Snyk IDSNYK-PYTHON-PYPDF-17900050
- published9 Jul 2026
- disclosed8 Jul 2026
- creditkoltiradw
Introduced: 8 Jul 2026
NewCVE-2026-59935 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.14.2 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 Infinite loop in the inline image decoding code in pypdf/generic/_image_inline.py. An attacker can hang text extraction or other content-stream parsing by supplying a PDF page with an unterminated inline image that uses the ASCII85 or ASCIIHex filter. When ContentStream._read_inline_image parses such malformed content, the decoder keeps scanning for the inline-image terminator instead of stopping at the end of the stream, so a crafted document can drive the parser into an endless loop and freeze the application processing the PDF.
Notes
- The infinite-loop path is in the inline-image readers for the
A85andAHxfilters, so PDFs that use other inline-image encodings are not part of this issue. - The hang shows up while parsing a page content stream, such as during text extraction or any other operation that walks
ContentStream; document rendering paths that do not parse inline image data are outside this scope.