{"id":"CVE-2026-57566","aliases":["EUVD-2026-117183","GHSA-c7mm-g2j2-98cx"],"status":"published","title":"Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy","description":"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.","severity":{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-14","score":0.00581,"percentile":0.48346,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-918"],"published":"2026-11-04T21:44:27Z","modified":"2026-11-05T20:04:58Z","products":[{"vendor":"readest","product":"readest"}],"references":[{"url":"https://github.com/readest/readest/security/advisories/GHSA-c7mm-g2j2-98cx","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/readest/readest/pull/4638","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/readest/readest/commit/495783d04516d05b2eb10f8f8bad297d436b36de","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/readest/readest/releases/tag/v0.11.10","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57566.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57566","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-57566","title":"Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy","description":"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.","status":"published","published":"2026-11-04T21:44:27.349Z","modified":"2026-11-05T20:04:58.115Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-918"],"updated_at":"2026-11-05T21:25:06.152449Z"}],"euvd":[{"id":"EUVD-2026-117183","description":"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.","status":"published","published":"2026-11-04T21:44:27Z","modified":"2026-11-05T20:04:58Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"updated_at":"2026-11-05T21:01:59.309255Z"}],"nvd":[{"id":"CVE-2026-57566","description":"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.","status":"published","published":"2026-11-04T22:18:06.85Z","modified":"2026-11-12T19:13:56.813Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-918"],"updated_at":"2026-11-12T21:32:42.315468Z"}],"osv":[{"id":"CVE-2026-57566","title":"Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy","description":"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.","status":"published","published":"2026-11-04T21:44:27.349Z","modified":"2026-11-14T02:30:46.009958245Z","cvss":[{"version":"3.1","score":9.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","level":"critical"}],"cwes":["CWE-918"],"updated_at":"2026-11-07T03:08:07.940184Z"}]}}