# CVE-2026-87733: ocaml-mirage-crypto: An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml

CVE-2026-87733 is fixed in ocaml-mirage-crypto on 1 platform by DEBIAN-CVE-2026-87733 (version 2.2.0-1), released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-87733
- Priority: Routine
- CVSS: 6.2 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ocaml-mirage-crypto Debian 14 | 2.2.0-1 | [DEBIAN-CVE-2026-87733](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87733.md) | Sep 10, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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