CVE-2026-121544— Koodo Reader through 2.4.6 Path Traversal via OPDS Cover and Download Handlers
Quick assessment
Affected
koodo-reader koodo-reader
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.
Koodo Reader 2.4.6 及更早版本存在路径遍历漏洞。该漏洞位于其自托管 HTTP 服务器的 OPDS 处理器中，允许已认证的攻击者读取上传目录之外的文件。攻击者可上传一个经过篡改的 books.db 文件，使其中的封面（cover）字段包含"../"序列，随后请求 端点，从而读取服务器进程可访问的任意文件。
Possible ATT&CK Techniques 2 AI
T1039 · Data from Network Shared Drive T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-121544
Vulnerability Information
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Vulnerability Title
Koodo Reader through 2.4.6 Path Traversal via OPDS Cover and Download Handlers
Source: CVE Program / CVE List V5
Vulnerability Description
Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server's OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| koodo-reader | koodo-reader | 0 ~ 2.4.6 | - |
|
II. Public POCs for CVE-2026-121544
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-121544 (7)
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https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L384-L431 technical-description
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https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L167-L194 technical-description
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https://github.com/koodo-reader/koodo-reader/issues/1654 issue-tracking
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