CVE-2026-57566
Dashboard / Vulnerabilities / CVE-2026-57566
Summary: Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy
Details: 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.
References: https://github.com/readest/readest/releases/tag/v0.11.10, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57566.json, https://github.com/readest/readest/security/advisories/GHSA-c7mm-g2j2-98cx, https://nvd.nist.gov/vuln/detail/CVE-2026-57566, https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36de, https://github.com/readest/readest/pull/4638
Affected packages
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