CVE-2026-22691
MEDIUM
GHSA-4f6g-68pf-7vhv
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
3Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
Analysis
pypdf versions prior to 6.6.0 are vulnerable to denial of service through CPU exhaustion when processing malformed PDF files with crafted startxref entries in non-strict reading mode. An attacker can create a specially crafted PDF containing excessive whitespace that causes the library to consume significant processing resources during cross-reference table reconstruction. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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