Unchecked Input for Loop Condition Affecting pypdf package, versions [,6.6.0)
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-14912440
- published13 Jan 2026
- disclosed9 Jan 2026
- creditN0zoM1z0
Introduced: 9 Jan 2026
CVE-2026-22690 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.6.0 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 Unchecked Input for Loop Condition in the processing of PDF files when the /Root entry is omitted from the trailer and a large /Size value is used. An attacker can cause excessive resource consumption and significantly increase processing time by submitting a malicious PDF file. This is only exploitable if non-strict reading mode is enabled.
Workaround
This vulnerability can be mitigated by enabling strict mode when reading or writing PDF files.