CVE-2026-89086 PUBLISHED

Assigner: mitre
Reserved: 10.09.2026 Published: 10.09.2026 Updated: 10.09.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 9.1

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

CVSS 3.1

Product Status

Vendor	OCaml
Product	jose
Versions	Default: unaffected affected from 0 to 0.11.0 (excl.)

References

https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e
https://osv.dev/vulnerability/OSEC-2026-19

Problem Types

CWE-347 Improper Verification of Cryptographic Signature CWE