CVE-2026-119206— pypdf: Possible long runtimes when retrieving page labels

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 6.21.3 版本之前，pypdf 在处理包含大量范围的扁平页标签数字树的特制 PDF 文件时，检索页标签所需的时间会异常过长。该问题源于属性在解析每一页时，都会从开头重复扫描同一个数组，导致计算量随页面数量和标签范围数量共同增长。此问题已在 6.21.3 版本中修复。

CVSS 7.1 · High Updated Oct 30, 2026

Possible ATT&CK Techniques 2 AI

T1068.001 T1562.006

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Vulnerability Information

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Vulnerability Title

pypdf: Possible long runtimes when retrieving page labels

Source: CVE Program / CVE List V5

Vulnerability Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.

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

Vendor	Product	Affected Versions	CPE	Subscribe
py-pdf	pypdf	< 6.21.3	-

II. Public POCs for CVE-2026-119206

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-119206

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Other References for CVE-2026-119206 (4)

https://github.com/py-pdf/pypdf/pull/4251 x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.21.3 x_refsource_MISC
https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-119206

Same Patch Batch · py-pdf · 2026-10-29 · 7 CVEs total

CVE-2026-119203	7.1 HIGH	pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer searc
CVE-2026-119204	7.1 HIGH	pypdf: Possible large memory usage when parsing page tree
CVE-2026-119207	7.1 HIGH	pypdf: Possible large memory usage for exceptions in strict mode
CVE-2026-119205	7.1 HIGH	pypdf: Possible infinite loop when cloning dictionaries
CVE-2026-119209	7.1 HIGH	pypdf: Possible large memory usage when parsing cross-reference streams
CVE-2026-119208	7.1 HIGH	pypdf: Possible long runtimes/large memory usage for encrypted PDF files

IV. Related Vulnerabilities

Same product: pypdf

Same vendor: py-pdf

Same weakness: CWE-400