Readest up to 0.11.9 OPDS Proxy route.ts url server-side request forgery

Summaryinfo

A vulnerability was found in Readest up to 0.11.9. It has been declared as critical. The impacted element is an unknown function of the file apps/readest-app/src/app/api/opds/proxy/route.ts of the component OPDS Proxy. The manipulation of the argument url results in server-side request forgery. This vulnerability is reported as CVE-2026-57566. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Readest up to 0.11.9. Affected is some unknown processing of the file apps/readest-app/src/app/api/opds/proxy/route.ts of the component OPDS Proxy. The manipulation of the argument url with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Readest is a modern, feature-rich ebook reader designed for seamless cross-platform access and an intuitive reading experience. Prior to 0.11.10, the unauthenticated /api/opds/proxy route in apps/readest-app/src/app/api/opds/proxy/route.ts accepted an attacker-controlled URL and fetched it server-side without restricting the scheme, blocking private, loopback, link-local, or metadata hosts, or revalidating destinations during automatic redirect following. The route also accepted caller-controlled outbound headers and Authorization values and reflected the upstream status and response body. A remote attacker could use the service as an open request proxy and, on Node, Docker, or other self-hosted deployments with internal-network access, retrieve cloud metadata or internal-service responses. Cloudflare Workers deployments restrict access to link-local and private destinations, which reduces the internal-network impact there, but the unauthenticated public fetch-and-reflect behavior remains. This issue is fixed in version 0.11.10.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-57566 since 06/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 0.11.10 eliminates this vulnerability.

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Productinfo

Name

• Readest

Version

• 0.11.0
• 0.11.1
• 0.11.2
• 0.11.3
• 0.11.4
• 0.11.5
• 0.11.6
• 0.11.7
• 0.11.8
• 0.11.9

Website

• Product: https://github.com/readest/readest/

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