# CVE-2026-48156

## Summary

- **CVE ID:** CVE-2026-48156
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-834
- **Published:** May 28, 2026
- **Last Modified:** May 30, 2026

## Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

## Affected Products

- py-pdf — pypdf (< 6.12.0)

## References

- [CNA](https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6)
- [CNA](https://github.com/py-pdf/pypdf/pull/3791)
- [CNA](https://github.com/py-pdf/pypdf/releases/tag/6.12.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._