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CVE-2026-27026
Published: Feb 20, 2026
Modified: Feb 24, 2026
PUBLISHED
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.
| Vendor | Product | Versions |
|---|---|---|
py-pdf | pypdf | affected < 6.7.1 |
Weaknesses (CWE)
References
https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/3644
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.7.1
x_refsource_MISC
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