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CVE-2026-48156

Published: May 28, 2026

Modified: May 30, 2026

PUBLISHED

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

Vendor	Product	Versions
py-pdf	pypdf	affected `< 6.12.0`

Weaknesses (CWE)

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6

x_refsource_CONFIRM

https://github.com/py-pdf/pypdf/pull/3791

x_refsource_MISC

https://github.com/py-pdf/pypdf/releases/tag/6.12.0

x_refsource_MISC

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