CVE-2026-115580— pypdf: Possible long runtimes for large xref table header limits
Quick assessment
Affected
py-pdf pypdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
pypdf 是一个免费且开源的纯 Python PDF 库。在 6.21.2 版本之前，攻击者可以构造一个 PDF 文件，使其标准交叉引用表中声明的条目数量超过文件实际可容纳的数量，从而导致在打开该文件时出现过度处理和运行时间过长的情况。该问题已在 6.21.2 版本中修复。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-115580
Vulnerability Information
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Vulnerability Title
pypdf: Possible long runtimes for large xref table header limits
Source: CVE Program / CVE List V5
Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度迭代
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-115580
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-115580 (1)
Vendor Advisories for CVE-2026-115580 (1)
Vendor Pages for CVE-2026-115580 (1)
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🔗 Release Version 6.21.2, 2026-10-21 · py-pdf/pypdf · GitHub x_refsource_MISC
Same Patch Batch · py-pdf · 2026-10-23 · 3 CVEs total
| CVE-2026-115572 | 7.1 HIGH | pypdf: Possible long runtimes for repeated references to the same missing object |
| CVE-2026-115585 | 7.1 HIGH | pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up) |
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V. Comments for CVE-2026-115580
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