What’s Vulnerable › Vulnerabilities

CVE-2026-113795: pypdf: Possible large memory usage for streams with multiple filters

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-30
• Weakness: CWE-400

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, accessing a crafted PDF stream with a large number of filters or multiple filters that pass around large amounts of data can cause large memory consumption. This issue is fixed in version 6.20.0.

Affected products

• py-pdf pypdf: before 6.20.0

References

• https://github.com/py-pdf/pypdf/commit/80a84d4be6022d910874ccb0d2365400f3f0e185
• https://github.com/py-pdf/pypdf/pull/4173
• https://github.com/py-pdf/pypdf/releases/tag/6.20.0
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-7mh2-4gg2-979f

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