pypdf: Possible large memory usage for form XObjects during text extraction

GHSA-j543-4vmf-qm7v · CVE-2026-49461 · PYSEC-2026-3020

Published Jun 16, 2026 · Modified Jul 13, 2026

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Description

Impact

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.

Patches

This has been fixed in pypdf==6.12.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3805.

References

WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-j543-4vmf-qm7v
WEB https://github.com/py-pdf/pypdf/pull/3805
PACKAGE https://github.com/py-pdf/pypdf
WEB https://github.com/py-pdf/pypdf/releases/tag/6.12.2

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