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CVE-2026-89086

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-22
• Weakness: CWE-347

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.

Affected products

• OCaml jose: before 0.11.0 — fixed in 0.11.0

How to fix

Upgrade to a fixed version: OCaml jose 0.11.0. Check the vendor advisory for mitigations.

References

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

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