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pypdf CVE-2026-59938

| EUVDEUVD-2026-42343 MEDIUM
Memory Allocation with Excessive Size Value (CWE-789)
2026-07-08 GitHub_M
Python Information Disclosure Pypdf
6.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-delivered PDF, no auth or interaction needed; availability impact is low (memory exhaustion, not guaranteed crash); no confidentiality or integrity impact per description.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 08, 2026 - 19:01 EUVD
Analysis Generated
Jul 08, 2026 - 17:50 vuln.today

DescriptionCVE.org

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

AnalysisAI

Uncontrolled memory allocation in pypdf prior to 6.14.0 allows remote, unauthenticated attackers to exhaust host memory by submitting a crafted PDF containing image metadata with inflated declared sizes that vastly exceed the actual embedded image data. Any application that uses pypdf to parse untrusted PDFs is exposed; the library allocates memory proportional to the declared (attacker-controlled) size rather than the actual data length. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PDF with inflated image size declarations
Delivery
Deliver PDF to target parsing endpoint
Exploit
pypdf parses image metadata
Execution
Allocates memory matching declared size
Persist
Host process memory exhausted
Impact
Service degradation or OOM condition
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Vulnerability AssessmentAI

Exploitation The only prerequisite is the ability to supply a crafted PDF to any code path that invokes pypdf's image parsing functionality. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 (VA:L) reflects a moderate availability impact with no confidentiality or integrity dimension, consistent with a resource-exhaustion denial-of-service. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker uploads or delivers a maliciously crafted PDF to a web application or automated pipeline that uses pypdf for document processing. The PDF contains image objects with declared size values in the gigabyte range but minimal actual data. …
Remediation Upgrade pypdf to version 6.14.0 or later, which is the vendor-released patch addressing this issue (https://github.com/py-pdf/pypdf/releases/tag/6.14.0). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-59938 vulnerability details – vuln.today
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