CVE-2026-27025— pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
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I. Basic Information for CVE-2026-27025
Vulnerability Information
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Vulnerability Title
pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
Source: NVD (National Vulnerability Database)
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. This vulnerability is fixed in 6.7.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
过度迭代
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 6.7.1之前版本存在安全漏洞，该漏洞源于解析字体中具有异常大值的/ToUnicode条目，可能导致长时间运行和大量内存消耗。
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-2026-27025
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Same Patch Batch · py-pdf · 2026-02-20 · 3 CVEs total
| CVE-2026-27026 | pypdf possibly has long runtimes for malformed FlateDecode streams | |
| CVE-2026-27024 | pypdf has a possible infinite loop when processing TreeObject |
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-834
- CVE-2026-41313
pypdf: Possible long runtimes for wrong size values in incre - CVE-2026-41168
pypdf has possible long runtimes for wrong size values in cr - CVE-2025-67726
Tornado is Vulnerable to Quadratic DoS via Crafted Multipart - CVE-2025-62707
pypdf affected by possible infinite loop when reading DCT in - CVE-2025-6714
Incorrect Handling of incomplete data may prevent mongoS fro
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