In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OCaml jose unaffected
Version Status Constraints
0 affected < 0.11.0

No data.

No data.

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No data.

Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e cve-icon cve-icon
https://osv.dev/vulnerability/OSEC-2026-19 cve-icon cve-icon
History

Thu, 10 Sep 2026 22:45:00 +0000

Type Values Removed Values Added
Title Incomplete RSA Signature Validation in OCaml jose Before 0.11.0

Thu, 10 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 10 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
Description In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-10T21:00:25.030Z

Reserved: 2026-09-10T19:52:46.560Z

Link: CVE-2026-89086

cve-icon Vulnrichment

Updated: 2026-09-10T20:55:23.339Z

cve-icon NVD

Status : Received

Published: 2026-09-10T20:17:32.113

Modified: 2026-09-10T21:17:52.570

Link: CVE-2026-89086

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T22:30:08Z

Weaknesses