Memory Consumption Issue in pypdf - PDF Library by PyPDF
CVE-2026-113790

6MEDIUM

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
21 October 2026

What is CVE-2026-113790?

The pypdf library, a popular open-source PDF handling tool written in pure Python, has a vulnerability that can be exploited by an attacker. This involves creating a specially crafted PDF document containing oversized arrays or dictionaries, which can lead to excessive memory usage during parsing. This issue impacts versions prior to 6.21.0 and has been addressed in the latest release. Users are strongly advised to update to the newer version to mitigate potential risks associated with this vulnerability.

Affected Version(s)

pypdf < 6.21.0

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4218
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a...
x_refsource_MISC

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.