# CVE-2026-87733

## Summary

- **CVE ID:** CVE-2026-87733
- **Severity:** MEDIUM
- **CVSS Score:** 6.2 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-295
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml. The ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets accept 0x00, the encoding of the point at infinity, as a public key. With that public key, signatures can be forged without a private key.

## Affected Products

- OCaml — mirage-crypto-ec (0)

## References

- [CNA](https://osv.dev/vulnerability/OSEC-2026-13)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.10%
- **EPSS Percentile:** 1.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._