Denial of Service Vulnerability in pypdf PDF Library
CVE-2026-113794

6MEDIUM

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
21 October 2026

What is CVE-2026-113794?

The pypdf library, a widely-used open-source pure-Python PDF manipulation tool, is susceptible to a Denial of Service vulnerability prior to version 6.20.0. An attacker can exploit this issue by crafting an incomplete PDF document that prematurely concludes within a standard cross-reference table. This leads to the mishandling of the unexpected EOF (End of File) condition, triggering an infinite loop in the library, which can cause application hang or crash. Users are urged to upgrade to version 6.20.0 or later to mitigate this risk.

Affected Version(s)

pypdf < 6.20.0

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/issues/4169
x_refsource_MISC
https://github.com/py-pdf/pypdf/pull/4170
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

.