VulnerabilityAnalyzed

CVE-2026-112391

The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append.

MEDIUM 6.3EPSS 0.58%

Does this matter?

Lower severity and a low EPSS score (0.58%). Track it; it rarely justifies an emergency change on its own.

Description

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow's PdfParser.get_value() can recurse without a limit while reading nested PDF objects. The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append. An attacker can provide a deeply nested PDF to an application that saves an image with PDF append enabled. This can raise an uncaught RecursionError or terminate the worker, causing denial of service. This issue is fixed in version 13.0.0.

CVSS 4.0: 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.58% probability · 47th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-835
Affected: python/pillow
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.3% on 20 October 2026 to 0.6% on 26 October 2026.

References

https://github.com/python-pillow/Pillow/commit/94cb11c44ff7345414da17ebfea1598a529ad9cdPatch
https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-254f-3936-288hExploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.