CVE-2026-49461: pypdf: Possible large memory usage for form XObjects during text extraction

June 16, 2026

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references.

References

github.com/advisories/GHSA-j543-4vmf-qm7v
github.com/py-pdf/pypdf/pull/3805
github.com/py-pdf/pypdf/releases/tag/6.12.2
github.com/py-pdf/pypdf/security/advisories/GHSA-j543-4vmf-qm7v
nvd.nist.gov/vuln/detail/CVE-2026-49461

Code Behaviors & Features

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