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CVE-2026-49452— WeasyPrint: CSS Injection via Presentational Hints

Quick assessment

Affected
Kozea WeasyPrint
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.

Kozea WeasyPrint是Kozea组织开源的一个将HTML和CSS文档渲染为PDF的软件库。 Kozea WeasyPrint 69.0之前版本存在输入验证错误漏洞，该漏洞源于未转义的HTML presentational-hint属性值被嵌入CSS中，可能导致CSS注入和服务器端请求。

CVSS 6.5 · Medium EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
Kozea WeasyPrint < 69.0 affected
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I. Basic Information for CVE-2026-49452

Vulnerability Information
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Vulnerability Title
WeasyPrint: CSS Injection via Presentational Hints
Source: CVE Program / CVE List V5
Vulnerability Description
WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/__init__.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Kozea WeasyPrint 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kozea WeasyPrint是Kozea组织开源的一个将HTML和CSS文档渲染为PDF的软件库。 Kozea WeasyPrint 69.0之前版本存在输入验证错误漏洞，该漏洞源于未转义的HTML presentational-hint属性值被嵌入CSS中，可能导致CSS注入和服务器端请求。
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
Kozea WeasyPrint < 69.0 -

II. Public POCs for CVE-2026-49452

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III. Intelligence Information for CVE-2026-49452

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Patches & Fixes for CVE-2026-49452 (1)

Vendor Advisories for CVE-2026-49452 (1)

Vendor Pages for CVE-2026-49452 (1)

IV. Related Vulnerabilities

Same product: WeasyPrint
Same vendor: Kozea
Same weakness: CWE-74

V. Comments for CVE-2026-49452

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