Memory Consumption Vulnerability in pypdf Library by PyPDF
CVE-2026-113791

6MEDIUM

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
21 October 2026

What is CVE-2026-113791?

The pypdf library, an open-source pure-Python PDF parser, is susceptible to a memory consumption issue due to crafted PDF files containing multiple small operations in their content streams. Attackers could exploit this vulnerability in versions earlier than 6.21.0, leading to significant memory usage during parsing. Users are recommended to upgrade to version 6.21.0 or later to mitigate this risk.

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

.