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CVE-2026-28351

5.3 · MEDIUM

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

Published Feb 27, 2026CWE-400EPSS 0.55%

Overview

CVE-2026-28351 is a medium-severity vulnerability. It was published on February 27, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

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/commit/f309c6003746414dc7b5048c19e6d879ff2dc858GitHubgithub.com/py-pdf/pypdf/pull/3664GitHubgithub.com/py-pdf/pypdf/releases/tag/6.7.4GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-28351?

CVE-2026-28351 is a medium-severity vulnerability. It was published on February 27, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-28351?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-28351?

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-2026-28351?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-28351 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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