Denial of Service Vulnerability in pypdf PDF Library
CVE-2026-115572

7.1HIGH

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
23 October 2026

What is CVE-2026-115572?

The pypdf library, a free and open-source PDF manipulation tool, is susceptible to a denial of service vulnerability prior to version 6.21.2. An attacker can exploit this flaw by crafting a specially designed PDF that contains multiple references to a nonexistent indirect object. This leads to repeated attempts to load missing file parts, significantly impacting performance and causing excessive resource consumption during file access. Users are advised to upgrade to version 6.21.2 to mitigate this issue.

Affected Version(s)

pypdf < 6.21.2

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4240
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c...
x_refsource_MISC

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.