CVE-2026-40260

Summary

pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. An attacker who exploits this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. This issue has been fixed in version 6.10.0.

Affected Software

Weaknesses

• CWE-776: CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx
• https://github.com/py-pdf/pypdf/pull/3724
• https://github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8
• https://github.com/py-pdf/pypdf/releases/tag/6.10.0

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