CVE-2026-119207: DoS

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-405 CWE-405

References

Other References

https://github.com/py-pdf/pypdf/commit/64270258c0eced720f7960aecf8cef31afd39f8d https://github.com/py-pdf/pypdf/pull/4265 https://github.com/py-pdf/pypdf/releases/tag/6.21.3 https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vqv-7265-gm2w

Frequently Asked Questions

What is CVE-2026-119207? +

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.

How do I check if I'm vulnerable to CVE-2026-119207? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-119207