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CVE-2026-49460— pypdf: Inefficient decoding of FlateDecode PNG predictor streams

Quick assessment

Affected
py-pdf pypdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

py-pdf pypdf是py-pdf组织开源的一个免费开源的纯 python PDF 库。能够拆分、合并、裁剪和转换 PDF 文件的页面。 pypdf 6.12.2之前版本存在资源管理错误漏洞，该漏洞源于访问使用了PNG预测器的/FlateDecode过滤器的流，可能导致攻击者制作PDF文件造成长时间运行。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
py-pdf pypdf < 6.12.2 affected
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I. Basic Information for CVE-2026-49460

Vulnerability Information
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Vulnerability Title
pypdf: Inefficient decoding of FlateDecode PNG predictor streams
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
pypdf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
py-pdf pypdf是py-pdf组织开源的一个免费开源的纯 python PDF 库。能够拆分、合并、裁剪和转换 PDF 文件的页面。 pypdf 6.12.2之前版本存在资源管理错误漏洞，该漏洞源于访问使用了PNG预测器的/FlateDecode过滤器的流，可能导致攻击者制作PDF文件造成长时间运行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
py-pdf pypdf < 6.12.2 -

II. Public POCs for CVE-2026-49460

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III. Intelligence Information for CVE-2026-49460

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Patches & Fixes for CVE-2026-49460 (2)

Vendor Advisories for CVE-2026-49460 (1)

Same Patch Batch · py-pdf · 2026-06-22 · 5 CVEs total

CVE-2026-54530 pypdf: Possible infinite loop when retrieving fonts for layout-mode text extraction
CVE-2026-54651 pypdf: Possible infinite loop when processing threads/articles in writer
CVE-2026-54531 pypdf: Possible infinite loop when processing outlines/bookmarks in writer
CVE-2026-49461 pypdf: Possible large memory usage for form XObjects during text extraction

IV. Related Vulnerabilities

Same product: pypdf
Same vendor: py-pdf
Same weakness: CWE-407

V. Comments for CVE-2026-49460

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