CVE-2026-89086CWE-347

CVE-2026-89086

Critical · published September 11, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
19.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00276 · 19.0th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-09-11T00:17Z
References (2)
https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e · [email protected]https://osv.dev/vulnerability/OSEC-2026-19 · [email protected]
EPSS history
Timeline
  • 12 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 10 SEP 19:52Z
    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…
    cvelistv5