CVE-2026-49460 | pypdf is a free and open-source pure-python PDF library. Pri… | CVSS 5.1 MEDIUM

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.

Metadata

CVE ID: CVE-2026-49460
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-30 02:43 UTC
Published: 2026-06-22 20:28 UTC
Last updated: 2026-06-22 20:28 UTC
Primary CWE: CWE-407
CWE-407: Inefficient Algorithmic Complexity
Vendor / Product: py-pdf / pypdf
Sources: cve.org · NVD

Severity & Metrics

5.1 MEDIUM CVSS 4.0

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

Affected products (1)

Vendor	Product	Platform	Versions
py-pdf	pypdf	—	< 6.12.2

Weakness (CWE)

CWE	Source	Description
CWE-407	cna	CWE-407: Inefficient Algorithmic Complexity

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.1	MEDIUM	4.0	cna	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

References (3)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hgr-hg42-57jg https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hgr-hg42-57jg
https://github.com/py-pdf/pypdf/pull/3806 https://github.com/py-pdf/pypdf/pull/3806
https://github.com/py-pdf/pypdf/releases/tag/6.12.2 https://github.com/py-pdf/pypdf/releases/tag/6.12.2