CVE-2026-89086 Details
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.
A vulnerability exists in the JOSE package for OCaml, specifically in versions prior to 0.11.0. The issue arises because the library's RSA signature validation process only verifies that the PKCS #1 decoding is correct. It fails to properly validate the signature against the public key, allowing for potential forgery of signatures.
Users can upgrade to JOSE version 0.11.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 10, 2026CISA-ADP
Assessed Sep 10, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e | [email protected] | Source CodeVendor |
| https://osv.dev/vulnerability/OSEC-2026-19 | [email protected] | AdvisoryExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| jose | < 0.11.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 10, 2026 | CVE Modified | CISA-ADP |
| Sep 10, 2026 | New CVE Received | [email protected] |