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CVE-2026-82642— Readest: unsanitized iframe srcdoc attribute in the EPUB sanitizer can lead to arbitrary code execution

Quick assessment

Affected
readest readest
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.

Readest是Readest社区开源的一款免费的 EPUB 和 PDF 电子书阅读器。 Readest 0.11.16之前版本存在跨站脚本漏洞，该漏洞源于EPUB章节HTML清理不当，DOMPurify配置仅禁止script标签且未解析iframe的srcdoc属性，攻击者可利用iframe嵌入恶意脚本，导致任意代码执行。

CVSS 8.8 · High EPSS 0.66% · P52

Affected Version Matrix 1

VendorProduct Version RangeStatus
readest readest < 0.11.16 affected
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I. Basic Information for CVE-2026-82642

Vulnerability Information
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Vulnerability Title
Readest: unsanitized iframe srcdoc attribute in the EPUB sanitizer can lead to arbitrary code execution
Source: CVE Program / CVE List V5
Vulnerability Description
Readest is an open-source e-book reader built on Tauri. In versions prior to 0.11.16, EPUB chapter HTML is sanitized with DOMPurify using a configuration that forbade only the <script> tag (FORBID_TAGS: ['script']) in apps/readest-app/src/services/transformers/sanitizer.ts. DOMPurify does not parse the contents of the srcdoc attribute on <iframe> elements, treating it as an opaque string attribute, so an attacker who can get an <iframe> element to survive sanitization can embed a complete HTML document containing a <script> tag inside srcdoc and have it execute when the browser renders the iframe. The content iframe is configured with sandbox="allow-same-origin allow-scripts", so script executing inside it shares the parent origin and can reach parent.parent.__TAURI_INTERNALS__.invoke(...), giving access to every Tauri IPC command the application is permitted to use, which escalates to arbitrary code execution. The payload can be made invisible (zero-size, transparent iframe) so the reader sees only normal book text. Version 0.11.16 hardened the sanitizer configuration by adding 'iframe', 'object' and 'embed' to FORBID_TAGS and adding 'srcdoc' to FORBID_ATTR.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Readest 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Readest是Readest社区开源的一款免费的 EPUB 和 PDF 电子书阅读器。 Readest 0.11.16之前版本存在跨站脚本漏洞，该漏洞源于EPUB章节HTML清理不当，DOMPurify配置仅禁止script标签且未解析iframe的srcdoc属性，攻击者可利用iframe嵌入恶意脚本，导致任意代码执行。
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
readest readest 0 ~ 0.11.16 -

II. Public POCs for CVE-2026-82642

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III. Intelligence Information for CVE-2026-82642

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Patches & Fixes for CVE-2026-82642 (2)

Vendor Advisories for CVE-2026-82642 (1)

Vendor Pages for CVE-2026-82642 (1)

IV. Related Vulnerabilities

Same product: readest
Same vendor: readest
Same weakness: CWE-79