CVE-2026-87733 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://osv.dev/vulnerability/OSEC-2026-13

History

Wed, 09 Sep 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 09 Sep 2026 12:15:00 +0000

Type	Values Removed	Values Added
Title		ECDSA Public Key Point at Infinity Forgery in Mirage‑Crypto‑EC Library

Wed, 09 Sep 2026 04:30:00 +0000

Type	Values Removed	Values Added
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.
Weaknesses		CWE-295
References		https://osv.dev/vulnerability/OSEC-2026-13
Metrics		cvssV3_1 `{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}`

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-09-09T04:08:54.652Z

Updated: 2026-09-09T13:02:51.213Z

Reserved: 2026-09-09T04:08:54.293Z

Link: CVE-2026-87733

Vulnrichment

Updated: 2026-09-09T13:02:44.741Z

NVD

Status : Deferred

Published: 2026-09-09T05:18:20.430

Modified: 2026-09-09T16:04:24.933

Link: CVE-2026-87733

Redhat

No data.

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