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CVE-2026-48156

3.3 · LOW

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

Published May 28, 2026CWE-834EPSS 0.17%

Overview

CVE-2026-48156 is a low-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. 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 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

GitHubgithub.com/py-pdf/pypdf/pull/3791GitHubgithub.com/py-pdf/pypdf/releases/tag/6.12.0GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48156?

CVE-2026-48156 is a low-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

How severe is CVE-2026-48156?

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. 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-2026-48156?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2026-48156?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48156 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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