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CVE-2026-113786

pypdf: Unvalidated JPEG image data loading

LOW
2.3
CVSS Score
Published: October 21, 2026 at 02:38 PM UTC
Updated: October 27, 2026 at 11:16 PM UTC
1 product affected across 1 vendorPypdf

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Severity
LOW2.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.1, an attacker can craft a PDF containing image data labeled with the /DCTDecode filter that causes Pillow to select and invoke an unintended image parser when the image is loaded. Environments without the optional Pillow dependency are not affected. This issue is fixed in version 6.21.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Pypdf· Py PDF
90%
v < 6.21.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hx5-vpf9-5wcv
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/pull/4222
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/commit/512d8eb94eb04be1d1c90504e6da2dcef8679e07
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/releases/tag/6.21.1

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-20CWE-183

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