Denial of Service Vulnerability in Pillow Imaging Library by Python
CVE-2026-112391

6.3MEDIUM

Key Information:

Vendor

Python-pillow

Status
Pillow
Vendor
CVE Published:
19 October 2026

What is CVE-2026-112391?

The Pillow Imaging Library, utilized for processing images in Python, has a vulnerability in its PdfParser.get_value() function. From versions 5.1.0 to 12.0.0, this function can allow unlimited recursion when handling nested PDF objects. An attacker can exploit this vulnerability by submitting a crafted PDF with deeply nested structures during the image append operation. This can lead to a denial of service, as the application may encounter an uncaught RecursionError or terminate unexpectedly. The issue has been resolved in version 13.0.0, and users are encouraged to upgrade to mitigate this risk.

Affected Version(s)

Pillow >= 5.1.0, < 13.0.0

References

https://github.com/python-pillow/Pillow/security/advisori...
x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/94cb11c44f...
x_refsource_MISC
https://github.com/python-pillow/Pillow/releases/tag/13.0.0
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.