What’s Vulnerable › Vulnerabilities

CVE-2026-102999: pypdf: Possible long runtimes with large amount of embedded files

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-05
• Weakness: CWE-400

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.

Affected products

• py-pdf pypdf: before 6.19.0 — fixed in 6.19.0

How to fix

Upgrade to a fixed version: py-pdf pypdf 6.19.0. Check the vendor advisory for mitigations.

References

• https://github.com/py-pdf/pypdf/commit/6b10556d13609a68f9ed18bb29fdd8bba88eb2c3
• https://github.com/py-pdf/pypdf/pull/4081
• https://github.com/py-pdf/pypdf/releases/tag/6.19.0
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-v247-6f48-mgcj

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