CVE-2026-48156

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.

PUBLISHED Reserved 2026-05-20 | Published 2026-05-28 | Updated 2026-05-30 | Assigner GitHub_M

Problem types

CWE-834: Excessive Iteration

Product status

References

github.com/.../pypdf/security/advisories/GHSA-248m-82v9-q6g6

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

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

cve.org (CVE-2026-48156)

nvd.nist.gov (CVE-2026-48156)

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