What’s Vulnerable › Vulnerabilities

CVE-2026-119207: pypdf: Possible large memory usage for exceptions in strict mode

• Severity: high (CVSS 7.1 v4.0)
• 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: 2026-10-29 · updated 2026-10-30
• Weakness: CWE-400

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.

Affected products

• py-pdf pypdf: before 6.21.3

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

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