{"id":"CVE-2026-77581","summary":"BentoPDF: SSRF in cors-proxy-worker.js via DNS-based hostname allowlist bypass","details":"BentoPDF is a client-side PDF toolkit that is self hostable. In 2.8.6 and earlier, the certificate and timestamp CORS proxy in cloudflare/cors-proxy-worker.js uses isPrivateOrReservedHost() to validate a supplied hostname separately from the DNS resolution used by fetch(targetUrl), allowing an attacker-controlled hostname to resolve to an internal or reserved destination after validation. A certificate-like path can satisfy ALLOWED_PATH_PATTERNS, and direct clients can forge the browser-oriented Origin header. Deployments without PROXY_SECRET skip the optional signature check, while the signature is an anti-abuse measure rather than a destination-security boundary. The proxy has a 10 MB response limit and can relay response bodies from reachable destinations. The advisory identifies both the official Worker deployment and self-hosted instances as impacted where the Worker execution environment can reach internal or reserved destinations. This vulnerability is fixed in 2.8.7.","aliases":["GHSA-5xjf-rr5x-pcfj"],"modified":"2026-09-26T03:47:38.162926557Z","published":"2026-09-24T15:23:18.550Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77581.json"},"references":[{"type":"WEB","url":"https://github.com/alam00000/bentopdf/releases/tag/v2.8.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77581.json"},{"type":"ADVISORY","url":"https://github.com/alam00000/bentopdf/security/advisories/GHSA-5xjf-rr5x-pcfj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77581"},{"type":"FIX","url":"https://github.com/alam00000/bentopdf/commit/45496fcd2ed6e02dcdde0d3839cc5024c091760c"},{"type":"FIX","url":"https://github.com/alam00000/bentopdf/commit/58cd1a8893bfe06e4a59a72adc2e7db00a8b9266"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/alam00000/bentopdf","events":[{"introduced":"0"},{"fixed":"45496fcd2ed6e02dcdde0d3839cc5024c091760c"},{"fixed":"58cd1a8893bfe06e4a59a72adc2e7db00a8b9266"},{"fixed":"55915a29017a5090a6ea61e61b0f4d899f032923"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.8.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.8.6","v2.8.5","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.0","v2.6.0","v2.5.0","v2.4.1","v2.4.0","v2.3.3","v2.3.1","v2.3.0","v2.2.1","v2.2.0","v2.1.0","v2.0.0","v1.16.1","v1.16.0","v1.15.4","v1.15.3","v1.15.1","v1.14.0","v1.11.2","v1.11.1","v1.11.0","v1.10.5","v1.10.4","v1.10.3","v1.10.1","v1.10.0","v1.9.0","v1.8.1","v1.8.0","v1.7.9","v1.7.8","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.1","v1.7.0","v1.6.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.0","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.5","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.2","v1.0.1","v1.0.0","v0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77581.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L"}]}