What’s Vulnerable › Vulnerabilities

CVE-2026-102994: pypdf: Possible long runtimes/large memory usage when parsing indirect objects

• 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 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.

Affected products

• py-pdf pypdf: before 6.18.0 — fixed in 6.18.0

How to fix

Upgrade to a fixed version: py-pdf pypdf 6.18.0. Check the vendor advisory for mitigations.

References

• https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e
• https://github.com/py-pdf/pypdf/pull/4055
• https://github.com/py-pdf/pypdf/releases/tag/6.18.0
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246

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