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pypdf CVE-2026-59936

| EUVDEUVD-2026-42366 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-07-08 GitHub_M
Python Denial Of Service Pypdf
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
7.5 HIGH

A crafted PDF reaches the parser with no auth or interaction (AV:N/PR:N/UI:N/AC:L); impact is an infinite-loop hang, so A:H only with C:N/I:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:H/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 - 21:04 EUVD
Analysis Generated
Jul 08, 2026 - 20:27 vuln.today

DescriptionCVE.org

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.1, an attacker can craft a PDF with a page content stream containing a not terminated inline image, causing an infinite loop during inline image end marker detection such as when extracting page text. This issue is fixed in version 6.14.1.

Articles & Coverage 1

News 10 New Python Vulnerabilities - 2 Critical, 8 High, 1 With POC Jul 09, 2026

AnalysisAI

Denial of service in the pypdf Python PDF library (all versions prior to 6.14.1) allows a remote attacker to hang a consuming application by supplying a malicious PDF. A page content stream containing an unterminated inline image drives the inline-image end-marker detection logic into an infinite loop, most notably triggered during page text extraction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PDF with unterminated inline image
Delivery
Submit file to PDF-processing service
Exploit
pypdf parses page content stream
Execution
Inline-image EI detection loops infinitely
Persist
CPU exhausted, worker hangs
Impact
Service denial for users
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application parse an attacker-supplied PDF using pypdf prior to 6.14.1, and specifically that it processes the page content stream - the documented trigger is page text extraction (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are internally consistent for a pure availability issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker uploads a specially crafted PDF containing a page content stream with an inline image that is never terminated by an 'EI' marker to a service that extracts text from uploaded documents (for example a document-processing pipeline, search indexer, or resume parser). When the backend calls pypdf to extract page text, the inline-image scan enters an infinite loop, pinning a CPU core and hanging that worker; repeated submissions can exhaust the worker pool and deny service to legitimate users. …
Remediation Upgrade to pypdf 6.14.1 or later, which fixes the inline-image end-marker loop (Vendor-released patch: 6.14.1; e.g. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all applications and systems running pypdf by version-check production, staging, and development environments. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-59936 vulnerability details – vuln.today
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