Memory Consumption Vulnerability in pypdf Library by PyPDF
CVE-2026-119207

7.1HIGH

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
29 October 2026

What is CVE-2026-119207?

The pypdf library, a pure-Python PDF toolkit, contains a vulnerability causing excessive memory consumption when strict mode processes a specially crafted invalid PDF dictionary. This is due to nested parsing failures that can lead to significant error messages being generated from a small malformed dictionary. Users are encouraged to upgrade to version 6.21.3, where this issue has been resolved, to ensure optimal performance and security.

Affected Version(s)

pypdf < 6.21.3

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4265
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/64270258c0eced720f...
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

.