What is CVE-2026-49460?

CVE-2026-49460 is a low-severity vulnerability in Py-Pdf Pypdf, classified under Inefficient Algorithmic Complexity. CVSS score: 3.3/10. Published 2026-06-22.

How severe is CVE-2026-49460?

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

Vulnerability in Py-Pdf Pypdf

CVE-2026-49460

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.

Published 2026-06-22 · last modified 2026-06-25.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.002 (5.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Py-Pdf Pypdf — versions < 6.12.2
Pypdf Project

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

github.com/py-pdf/pypdf/security/advisories/GHSA-5hgr-hg42-57jg (Patch, Vendor Advisory)
github.com/py-pdf/pypdf/pull/3806 (Patch, Issue Tracking)
github.com/py-pdf/pypdf/releases/tag/6.12.2 (Patch, Release Notes)

Frequently asked questions

What is CVE-2026-49460?: CVE-2026-49460 is a low-severity vulnerability in Py-Pdf Pypdf, classified under Inefficient Algorithmic Complexity. CVSS score: 3.3/10. Published 2026-06-22.
How severe is CVE-2026-49460?: Low severity. CVSS v3 base score is 3.3 out of 10.