What is CVE-2026-59935?

CVE-2026-59935 is a high-severity vulnerability in Py-Pdf Pypdf, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-59935?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Py-Pdf Pypdf

CVE-2026-59935

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craft a PDF with a page content stream containing a not terminated inline image that uses the ASCII85 or ASCIIHex filters, causing an infinite loop during parsing such as when extracting page text. This issue is fixed in version 6.14.2.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.1th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Py-Pdf Pypdf — versions < 6.14.2
Pypdf Project

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/py-pdf/pypdf/security/advisories/GHSA-g867-7843-wf8q (Patch, Vendor Advisory)
github.com/py-pdf/pypdf/pull/3892 (Patch, Issue Tracking)
github.com/py-pdf/pypdf/commit/5a33a46416aa1ae6c025ff90a3cca57631fdafd2 (Patch)
github.com/py-pdf/pypdf/releases/tag/6.14.2 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-59935?: CVE-2026-59935 is a high-severity vulnerability in Py-Pdf Pypdf, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-59935?: High severity. CVSS v3 base score is 7.5 out of 10.