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pypdf CVE-2026-84309

| EUVDEUVD-2026-69477 MEDIUM
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
2026-09-01 GitHub_M GHSA-jp53-mhqp-8xcg
Denial Of Service Python Red Hat Pypdf Py Pdf
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:L/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

Server-side PDF processing services receive files over the network; no credentials needed; pure availability impact with no confidentiality or integrity effect.

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
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Sep 01, 2026 - 21:03 EUVD
Source Code Evidence Fetched
Sep 01, 2026 - 20:55 vuln.today
Analysis Generated
Sep 01, 2026 - 20:55 vuln.today

DescriptionCVE.org

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.

AnalysisAI

Infinite loop denial of service in pypdf prior to 6.16.0 allows any attacker who can supply a crafted PDF to a pypdf-based write pipeline to permanently hang the processing worker. The root cause is in TreeObject.insert_child within pypdf/generic/_data_structures.py, which traverses /Next links without cycle detection; a PDF whose tree nodes form a circular reference (A→B→C→A) causes unbounded traversal. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The target application must use pypdf prior to 6.16.0 AND must invoke the write path on a user-supplied PDF - specifically, a code path that calls TreeObject.insert_child, such as merging PDFs, adding annotations, or inserting bookmarks. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The official CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:N/VA:H, score 6.9) models the vulnerability from the library's perspective - a malicious file on the local filesystem. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade pypdf to version 6.16.0 or later; this is the primary and complete fix, confirmed by the vendor release at https://github.com/py-pdf/pypdf/releases/tag/6.16.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-84309 vulnerability details – vuln.today
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