What is CVE-2026-71852?

CVE-2026-71852 is a low-severity vulnerability in Py-Pdf Pypdf, classified under Excessive Iteration. CVSS score: 3.3/10. Published 2026-08-07.

How severe is CVE-2026-71852?

Low severity. CVSS v3 base score is 3.3 out of 10.

Vulnerability in Py-Pdf Pypdf

CVE-2026-71852

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extraction. This issue is fixed in 6.15.0.

Published 2026-08-07 · last modified 2026-11-02.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.001 (2.2th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Py-Pdf Pypdf — versions < 6.15.0
Pypdf Project

Weakness classification (CWE)

CWE-834 — Excessive Iteration

References

github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7 (Patch)
github.com/py-pdf/pypdf/pull/3946 (Patch)
github.com/py-pdf/pypdf/releases/tag/6.15.0 (Release Notes)
github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-71852?: CVE-2026-71852 is a low-severity vulnerability in Py-Pdf Pypdf, classified under Excessive Iteration. CVSS score: 3.3/10. Published 2026-08-07.
How severe is CVE-2026-71852?: Low severity. CVSS v3 base score is 3.3 out of 10.