Medium severity · published Apr 16, 2026
CVE-2026-40260
pypdf: Manipulated XMP metadata entity declarations can exhaust RAM
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.10.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40260
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40260
Patch
https://github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8
Issue Tracking
https://github.com/py-pdf/pypdf/pull/3724
Product
https://github.com/py-pdf/pypdf/releases/tag/6.10.0
Mitigation
https://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx
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