{"id":"CVE-2026-77581","title":"BentoPDF is a client-side PDF toolkit that is self hostable","summary":"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…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","cwe":["CWE-918"],"vendor":"alam00000","product":"bentopdf","affected":["bentopdf < 2.8.7"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:10.943","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77581","references":[{"url":"https://github.com/alam00000/bentopdf/commit/45496fcd2ed6e02dcdde0d3839cc5024c091760c","label":"security-advisories@github.com"},{"url":"https://github.com/alam00000/bentopdf/commit/58cd1a8893bfe06e4a59a72adc2e7db00a8b9266","label":"security-advisories@github.com"},{"url":"https://github.com/alam00000/bentopdf/releases/tag/v2.8.7","label":"security-advisories@github.com"},{"url":"https://github.com/alam00000/bentopdf/security/advisories/GHSA-5xjf-rr5x-pcfj","label":"security-advisories@github.com"},{"url":"https://github.com/alam00000/bentopdf/security/advisories/GHSA-5xjf-rr5x-pcfj","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-24T15:37:09.697885Z"},"ingestedAt":"2026-09-24T15:45:56.658Z","slug":"CVE-2026-77581","body":"## Overview\n\nBentoPDF 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":59,"depthScoreParts":{"impact":47.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}