CVE-2026-28804— pypdf: Inefficient decoding of ASCIIHexDecode streams
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I. Basic Information for CVE-2026-28804
Vulnerability Information
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Vulnerability Title
pypdf: Inefficient decoding of ASCIIHexDecode streams
Source: NVD (National Vulnerability Database)
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
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 6.7.5之前版本存在安全漏洞，该漏洞源于使用/ASCIIHexDecode过滤器访问流时可能导致长时间运行，从而引发拒绝服务攻击。
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-2026-28804
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- Release Version 6.7.5, 2026-03-02 · py-pdf/pypdf · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-28804
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-407
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graphql-php: Denial of Service via quadratic complexity in O - CVE-2026-35599
Vikunja has an Algorithmic Complexity DoS in Repeating Task
V. Comments for CVE-2026-28804
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