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CVE-2026-113794

5.5 · MEDIUM

pypdf is a free and open-source pure-python PDF library.

Published Oct 21, 2026py-pdfCWE-835EPSS 0.47%

Overview

CVE-2026-113794 is a medium-severity vulnerability affecting py-pdf pypdf. It was published on October 21, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.

Remediation

Check the references section for vendor advisories and patches from py-pdf. Update pypdf to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
py-pdfpypdf>= 0, < 6.20.0Affected

References

GitHubgithub.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58GitHubgithub.com/py-pdf/pypdf/issues/4169GitHubgithub.com/py-pdf/pypdf/pull/4170GitHubgithub.com/py-pdf/pypdf/releases/tag/6.20.0GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-113794?

CVE-2026-113794 is a medium-severity vulnerability affecting py-pdf pypdf. It was published on October 21, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-113794?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-113794?

Check the references section for vendor advisories and patches from py-pdf. Update pypdf to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-113794?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-113794 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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