HIGH

CVE-2026-77581

CVSS v3

8.6

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-09-28

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

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

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Published: 2026-09-24
Last Modified: 2026-09-24

Frequently asked questions

What is CVE-2026-77581?

Is CVE-2026-77581 actively exploited?

Active exploitation of CVE-2026-77581 has not been confirmed. Its EPSS score was 0.3% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-77581?

CVE-2026-77581 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

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