CVE-2026-89086

CVSS 9.1 (critical) · published 2026-09-10

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.

Weakness: CWE-347

Source: NVD CVE-2026-89086

References

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

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