pypdf: Inefficient decoding of FlateDecode PNG predictor streams_CVE-2026-49460

5.1 / 10

MEDIUM

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

Description

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.

Basic Information

ID CVE-2026-49460

Source GitHub_M

Published Jun 22, 2026 at 20:28

Affected Product

Vendor py-pdf

Product pypdf

Version < 6.12.2

Affected Versions py-pdf pypdf < 6.12.2

CWE Classification

CWE-407

References

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    "published": "2026-06-22T20:28:16.413Z",
    "modified": "2026-06-22T20:28:16.413Z",
    "type": "cve",
    "title": "pypdf: Inefficient decoding of FlateDecode PNG predictor streams",
    "source": "GitHub_M",
    "references": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hgr-hg42-57jg\nhttps://github.com/py-pdf/pypdf/pull/3806\nhttps://github.com/py-pdf/pypdf/releases/tag/6.12.2",
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