EUVD-2026-42107Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploitation needs a locally delivered malicious EPUB the user must open (AV:L, UI:R), no app authentication (PR:N), and yields full host code execution (C/I/A:H).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Koodo Reader is an ebook reader. In version 2.3.0 and earlier, Koodo Reader is vulnerable to remote code execution through malicious EPUB files because the open-book IPC handler enables nodeIntegrationInSubFrames and EPUB chapter content is rendered with unsanitized innerHTML. An attacker can craft an EPUB book that, when imported and opened by the victim, instantiates a hidden iframe with Node.js API access and executes arbitrary operating system commands with the victim user's privileges. This issue is fixed in version 2.3.1.
AnalysisAI
Remote code execution in Koodo Reader (versions 2.3.0 and earlier) lets an attacker who supplies a malicious EPUB file run arbitrary OS commands with the victim's privileges once the book is imported and opened. The flaw combines a dangerously permissive Electron IPC handler (nodeIntegrationInSubFrames enabled) with unsanitized innerHTML rendering of chapter content, turning ebook display into a Node.js code-execution primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to import and then open an attacker-crafted EPUB file inside Koodo Reader 2.3.0 or earlier; the specific enabling conditions are the open-book IPC handler running with nodeIntegrationInSubFrames enabled and EPUB chapter content being rendered through unsanitized innerHTML, which together let book-supplied markup reach Node.js APIs. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 score is 8.4 (High) with vector AV:L/AC:L/AT:N/PR:N/UI:A and full VC/VI/VA:H - meaning complete compromise of the local system but gated behind local delivery and required user interaction (importing and opening a crafted book). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts an EPUB whose chapter HTML embeds JavaScript that, when rendered via innerHTML inside the Node-enabled iframe, invokes Node's child_process to run OS commands. They distribute it as a free book download, email attachment, or shared library file; when the victim imports and opens it in a vulnerable Koodo Reader, the payload silently executes with the victim's privileges. … |
| Remediation | Vendor-released patch: upgrade to Koodo Reader 2.3.1, which remediates the issue by removing the unsafe Node.js access path and/or sanitizing rendered EPUB content; see the advisory at https://github.com/koodo-reader/koodo-reader/security/advisories/GHSA-mjr7-w4jq-2rq9. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Koodo Reader installations in your environment and advise users to avoid opening ebook files from untrusted sources. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
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External POC / Exploit Code
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