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pypdf CVE-2026-48156

| EUVD-2026-32913 MEDIUM
Excessive Iteration (CWE-834)
2026-05-28 GitHub_M
Python Information Disclosure
5.1
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:L/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
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
Source Code Evidence Fetched
May 28, 2026 - 17:51 vuln.today
Analysis Generated
May 28, 2026 - 17:51 vuln.today
Patch available
May 28, 2026 - 17:01 EUVD
CVSS changed
May 28, 2026 - 16:22 NVD
5.1 (MEDIUM)
CVE Published
May 28, 2026 - 14:50 nvd
UNKNOWN (no severity yet)

DescriptionNVD

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

AnalysisAI

Denial-of-service via algorithmic complexity in pypdf before 6.12.0 allows an attacker who can supply a crafted PDF file to cause excessive processing time during cross-reference stream parsing. The vulnerability is triggered by crafting a PDF with /W [0 0 0] field values in a cross-reference stream combined with a large /Size value, which causes the library to perform unbounded iteration over zero-byte entries. …

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CVE-2026-48156 vulnerability details – vuln.today
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