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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63630
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:08 UTC
Updated2026-09-30 19:57:08 UTC
DescriptionBentoPDF 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.

Risk And Classification

Primary CVSS: v3.1 3.4 LOW from [email protected]

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

EPSS: 0.003090000 probability, percentile 0.212870000 (date 2026-09-29)

Problem Types: CWE-201 | CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.4LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
3.1CNADECLARED3.4LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Alam00000 Bentopdf affected < 2.8.7 Not specified

References

ReferenceSourceLinkTags
github.com/alam00000/bentopdf/security/advisories/GHSA-cx8x-7rrr-r9x8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/alam00000/bentopdf/commit/b21f602cca972320bfffbf72e37df535313... [email protected] github.com
github.com/alam00000/bentopdf/releases/tag/v2.8.7 [email protected] github.com
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