CVE-2026-115585— pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
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，针对 GHSA-55h5-xmcq-c37v 中重复出现的畸形交叉引用条目的修复措施并不完整：即使已存在恢复缓存，每次恢复尝试仍可能触发完整的 PDF 流重新加载，导致精心构造的交叉引用流引发极长的运行时间。该问题已在 6.21.2 版本中修复。
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I. Basic Information for CVE-2026-115585
Vulnerability Information
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Vulnerability Title
pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
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 incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. 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-2026-115585
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-115585 (2)
Vendor Advisories for CVE-2026-115585 (1)
Vendor Pages for CVE-2026-115585 (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-2026-115580 | 7.1 HIGH | pypdf: Possible long runtimes for large xref table header limits |
IV. Related Vulnerabilities
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V. Comments for CVE-2026-115585
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