CVE-2026-57566 (GCVE-0-2026-57566)

Vulnerability from cvelistv5 – Published: 2026-11-04 21:44 – Updated: 2026-11-04 21:44
VLAI
Title
Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy
Summary
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
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7886 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
readest readest Affected: < 0.11.10
guessed Create a notification for this product.
Show details on NVD website
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        }
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          "name": "https://github.com/readest/readest/security/advisories/GHSA-c7mm-g2j2-98cx",
          "tags": [
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        },
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          "tags": [
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          "url": "https://github.com/readest/readest/releases/tag/v0.11.10"
        }
      ],
      "source": {
        "advisory": "GHSA-c7mm-g2j2-98cx",
        "discovery": "UNKNOWN"
      },
      "title": "Readest: Unauthenticated SSRF / open request proxy in /api/opds/proxy"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-57566",
    "datePublished": "2026-11-04T21:44:27.349Z",
    "dateReserved": "2026-06-24T18:49:56.206Z",
    "dateUpdated": "2026-11-04T21:44:27.349Z",
    "state": "PUBLISHED"
  },
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                "vendor": "readest",
                "versions": [
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                    "version": "\u003c 0.11.10"
                  }
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            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
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            "value": "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."
          }
        ],
        "id": "CVE-2026-57566",
        "lastModified": "2026-11-04T22:18:06.850",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
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                "version": "3.1"
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        "published": "2026-11-04T22:18:06.850",
        "references": [
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          },
          {
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            "url": "https://github.com/readest/readest/pull/4638"
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            "source": "security-advisories@github.com",
            "url": "https://github.com/readest/readest/releases/tag/v0.11.10"
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        "vulnStatus": "Received",
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            "type": "Primary"
          }
        ]
      }
    }
  }
}



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