What is CVE-2026-59938?

CVE-2026-59938 is a medium-severity vulnerability in Py-Pdf Pypdf, classified under CWE-789. CVSS score: 5.3/10. Published 2026-07-08.

How severe is CVE-2026-59938?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Py-Pdf Pypdf

CVE-2026-59938

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

Published 2026-07-08 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (42.0th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Py-Pdf Pypdf — versions < 6.14.0
Pypdf Project

Weakness classification (CWE)

CWE-789

References

github.com/py-pdf/pypdf/security/advisories/GHSA-5qjq-93h5-hrgp (Patch, Vendor Advisory)
github.com/py-pdf/pypdf/pull/3888 (Patch, Issue Tracking)
github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a (Patch)
github.com/py-pdf/pypdf/releases/tag/6.14.0 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-59938?: CVE-2026-59938 is a medium-severity vulnerability in Py-Pdf Pypdf, classified under CWE-789. CVSS score: 5.3/10. Published 2026-07-08.
How severe is CVE-2026-59938?: Medium severity. CVSS v3 base score is 5.3 out of 10.