CVE-2026-59938: pypdf: Possible large memory usage for wrong image dimensions

July 23, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires loading images where the declared size values are much too large compared to the actual data.

References

github.com/advisories/GHSA-5qjq-93h5-hrgp
github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a
github.com/py-pdf/pypdf/pull/3888
github.com/py-pdf/pypdf/releases/tag/6.14.0
github.com/py-pdf/pypdf/security/advisories/GHSA-5qjq-93h5-hrgp
nvd.nist.gov/vuln/detail/CVE-2026-59938

Code Behaviors & Features

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