CVE-2026-115572— pypdf: Possible long runtimes for repeated references to the same missing object
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、开源的纯 Python PDF 库。在 6.21.2 版本之前，攻击者可构造一个 PDF 文件，使其反复引用同一个不存在的间接对象，导致在访问相关文件部分（如页面）时触发重复的全文件恢复加载，从而造成长时间的运行延迟。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-2026-115572
Vulnerability Information
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Vulnerability Title
pypdf: Possible long runtimes for repeated references to the same missing object
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 that repeatedly references the same nonexistent indirect object, causing relevant file parts such as pages to trigger repeated full-file recovery loads and long runtimes when accessed. 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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-115572
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-115572 (2)
Vendor Advisories for CVE-2026-115572 (1)
Vendor Pages for CVE-2026-115572 (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-2026-115580 | 7.1 HIGH | pypdf: Possible long runtimes for large xref table header limits |
| CVE-2026-115585 | 7.1 HIGH | pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up) |
IV. Related Vulnerabilities
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CVE-2026-115585
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Same vendor: py-pdf
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Same weakness: CWE-400
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V. Comments for CVE-2026-115572
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