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pypdf CVE-2026-59935

| EUVDEUVD-2026-42365 HIGH
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
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

Untrusted PDF processed by server-side pipelines gives AV:N/PR:N/UI:N with low complexity; impact is a pure availability hang, so C:N/I:N/A:H and scope unchanged.

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 - 20:28 vuln.today

DescriptionCVE.org

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craft a PDF with a page content stream containing a not terminated inline image that uses the ASCII85 or ASCIIHex filters, causing an infinite loop during parsing such as when extracting page text. This issue is fixed in version 6.14.2.

Articles & Coverage 1

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

AnalysisAI

Denial of service in pypdf before 6.14.2 lets a remote attacker hang any application that parses an attacker-supplied PDF: a page content stream carrying an unterminated inline image with an ASCII85 or ASCIIHex filter drives the parser into an infinite loop (CWE-835), most notably during page text extraction. The pure-Python library is very widely used in document-processing and data-ingestion pipelines, so a single malicious file can pin a CPU core and stall the worker. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PDF with unterminated inline image
Delivery
Upload to PDF-processing service
Exploit
Parser decodes A85/AHx inline image
Execution
Loop never reaches exit condition
Persist
CPU-bound infinite loop
Impact
Worker pool exhausted, denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application parse an attacker-supplied PDF with pypdf prior to 6.14.2 and reach the vulnerable code path - specifically page content-stream parsing such as page text extraction. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N, VC:N/VI:N/VA:H) scores 8.7 (High) and cleanly reflects a pure availability impact: no confidentiality or integrity loss, no privileges, no user interaction assumed, low attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker uploads a crafted PDF to a web service that uses pypdf for text extraction (e.g., a resume parser, invoice ingester, or search indexer). When the backend calls page text extraction on the file, the ASCII85/ASCIIHex inline-image decoder enters an infinite loop, consuming a CPU core and stalling the worker; repeated uploads exhaust the worker pool and take the service offline. …
Remediation Vendor-released patch: upgrade pypdf to 6.14.2 or later (pip install --upgrade 'pypdf>=6.14.2'), which fixes the unterminated-inline-image parsing loop; the fix is in PR https://github.com/py-pdf/pypdf/pull/3892 and commit 5a33a46416aa1ae6c025ff90a3cca57631fdafd2, described in advisory https://github.com/py-pdf/pypdf/security/advisories/GHSA-g867-7843-wf8q. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all applications and services using pypdf and assess exposure. …

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

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CVE-2026-59935 vulnerability details – vuln.today
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