BentoPDF: SSRF in cors-proxy-worker.js via DNS-based hostname allowlist bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77581
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:10 UTC
Updated2026-09-29 19:07:47 UTC
DescriptionBentoPDF 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

EPSS: 0.002660000 probability, percentile 0.168780000 (date 2026-09-29)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Alam00000 Bentopdf affected < 2.8.7 Not specified

References

ReferenceSourceLinkTags
github.com/alam00000/bentopdf/releases/tag/v2.8.7 [email protected] github.com
github.com/alam00000/bentopdf/security/advisories/GHSA-5xjf-rr5x-pcfj 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/alam00000/bentopdf/commit/45496fcd2ed6e02dcdde0d3839cc5024c09... [email protected] github.com
github.com/alam00000/bentopdf/commit/58cd1a8893bfe06e4a59a72adc2e7db00a8... [email protected] github.com
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