Observed Signal · Apr 15, 2026 · Vulnerability Disclosure · Source: DEV Community · Impact: 2/5 · Sentiment: Negative
pypdf DoS Bug via Malformed PDF Streams
A moderate-severity vulnerability (GHSA-JJ6C-8H6C-HPPX, CVSS 5.5) was published on 2026-04-15 affecting pypdf versions prior to 6.10.1. The issue stems from insufficient validation of cross-reference (xref) and object stream sizes, allowing maliciously crafted PDFs to trigger excessive iteration and uncontrolled resource consumption, resulting in denial of service (DoS). The advisory lists CWE-400 and CWE-834, notes an attack vector of local or remote file upload, and indicates a proof‑of‑concept exploit exists. The issue is fixed in pypdf v6.10.1; recommended mitigations include upgrading to >=6.10.1, enforcing timeouts, isolating PDF parsing into bounded subprocesses or containers, and applying OS/orchestrator memory limits.
Affects a widely used Python PDF parsing library and can cause DoS in web apps, document pipelines and serverless functions; requires dependency upgrades and operational mitigations but is not industry‑shifting.
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Key Takeaways & Evidence Grounding
- Vulnerability ID: GHSA-JJ6C-8H6C-HPPX
- CVSS Score: 5.5 (published 2026-04-15)
- Affected: pypdf versions earlier than 6.10.1; fixed in pypdf v6.10.1
- Impact: Denial of Service (uncontrolled resource consumption) via malformed PDF xref and object streams
- Exploit status: Proof‑of‑Concept (POC); Attack vector: local or remote via file upload
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