CVE-2026-33123— pypdf has inefficient decoding of array-based streams
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I. Basic Information for CVE-2026-33123
Vulnerability Information
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Vulnerability Title
pypdf has inefficient decoding of array-based streams
Source: NVD (National Vulnerability Database)
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
pypdf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pypdf是py-pdf开源的一个免费开源的纯 python PDF 库。能够拆分、合并、裁剪和转换 PDF 文件的页面。 pypdf 6.9.1之前版本存在安全漏洞，该漏洞源于处理恶意PDF时存在缺陷，可能导致长时间运行或大量内存使用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33123
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Patch · 1Vendor · 1Advisory · 1
- Release Version 6.9.1, 2026-03-17 · py-pdf/pypdf · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33123
IV. Related Vulnerabilities
Same product: pypdf
- CVE-2026-41314
pypdf: Manipulated FlateDecode image dimensions can exhaust - CVE-2026-41313
pypdf: Possible long runtimes for wrong size values in incre - CVE-2026-41312
pypdf: Manipulated FlateDecode predictor parameters can exha - CVE-2026-41168
pypdf has possible long runtimes for wrong size values in cr - CVE-2026-40260
pypdf: Manipulated XMP metadata entity declarations can exha
Same vendor: py-pdf
- CVE-2026-41314
pypdf: Manipulated FlateDecode image dimensions can exhaust - CVE-2026-41313
pypdf: Possible long runtimes for wrong size values in incre - CVE-2026-41312
pypdf: Manipulated FlateDecode predictor parameters can exha - CVE-2026-41168
pypdf has possible long runtimes for wrong size values in cr - CVE-2026-40260
pypdf: Manipulated XMP metadata entity declarations can exha
Same weakness: CWE-400
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