CVE-2026-84310

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

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Weakness Type (CWE)

CWE-405 CWE-405

CWE-834 CWE-834

References

Other References

https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 https://github.com/py-pdf/pypdf/pull/3966 https://github.com/py-pdf/pypdf/releases/tag/6.16.1 https://github.com/py-pdf/pypdf/security/advisories/GHSA-23w6-3w8w-8484

Frequently Asked Questions

What is CVE-2026-84310? +

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

How do I check if I'm vulnerable to CVE-2026-84310? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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