Vulnerability · Published Sep 24, 2026 · Assigned by GitHub_M

CVE-2026-63630BentoPDF: Workflow Import Allows Unvalidated TSA URL Leading to PDF Hash Exfiltration via RFC 3161 Requests

Low 3.4

In plain English

A low-severity unsafe deserialization in bentopdf from alam00000. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)3.4Low

Exploit odds (30 days)0.4%top 67.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

BentoPDF is a client-side PDF toolkit that is self hostable. In 2.8.6 and earlier, deserializeWorkflow() accepts the Timestamp node's tsaUrl control from imported JSON without schema or destination validation. When a user imports the crafted workflow and runs it against a PDF, timestampPdf() sends an RFC 3161 TimeStampReq containing the PDF's SHA-256 MessageImprint to the attacker-selected endpoint. The default self-hosted configuration does not set VITE_CORS_PROXY_URL, so the request bypasses the proxy's ALLOWED_TSA_HOSTS checks and is sent directly. The disclosed digest can confirm that a document matches a known file and can correlate the same document across users without revealing its contents. This vulnerability is fixed in 2.8.7.

Affected products (as reported)

Vendor	Product	Versions
alam00000	bentopdf	< 2.8.7

Weakness: CWE-502, CWE-201 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

References

https://github.com/alam00000/bentopdf/security/advisories/GHSA-cx8x-7rrr-r9x8 x_refsource_CONFIRM
https://github.com/alam00000/bentopdf/commit/b21f602cca972320bfffbf72e37df535313a6e48 x_refsource_MISC
https://github.com/alam00000/bentopdf/releases/tag/v2.8.7 x_refsource_MISC