What’s Vulnerable › Vulnerabilities

CVE-2026-115572: pypdf: Possible long runtimes for repeated references to the same missing object

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-29
• Weakness: CWE-400

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF that repeatedly references the same nonexistent indirect object, causing relevant file parts such as pages to trigger repeated full-file recovery loads and long runtimes when accessed. This issue is fixed in version 6.21.2.

Affected products

• py-pdf pypdf: before 6.21.2

References

• https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
• https://github.com/py-pdf/pypdf/pull/4240
• https://github.com/py-pdf/pypdf/releases/tag/6.21.2
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-6c7f-9265-g8fw

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