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GHSA-JJ6C-8H6C-HPPX: GHSA-JJ6C-8H6C-HPPX: Uncontrolled Resource Consumption in pypdf via Malformed PDF Streams

GHSA-JJ6C-8H6C-HPPX: Uncontrolled Resource Consumption in pypdf via Malformed PDF Streams Vulnerability ID: GHSA-JJ6C-8H6C-HPPX CVSS Score: 5.5 Published: 2026-04-15 The pypdf library prior to version 6.10.1 contains a moderate-severity vulnerability related to the handling of cross-reference (xref) and object streams. The library fails to adequately validate the sizes of these streams against supplied metadata, leading to excessive iteration and uncontrolled resource consumption when parsing maliciously crafted PDF documents. TL;DR pypdf versions prior to 6.10.1 are vulnerable to Denial of Service (DoS) due to inadequate validation of xref and object stream sizes, allowing crafted PDFs to trigger unbounded resource consumption. ⚠️ Exploit Status: POC Technical Details Vulnerability Type: Uncontrolled Resource Consumption CWE IDs: CWE-400, CWE-834 Attack Vector: Local / Remote via File Upload Impact: Denial of Service (DoS)

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