CVE-2026-87733 Details
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.
A vulnerability exists in the OCaml library mirage-crypto-ec, specifically in versions prior to 2.2.0. The issue arises because the ECDSA functions for the P256, P384, and P521 curves accept the point at infinity, encoded as 0x00, as a valid public key. This acceptance allows for the forgery of signatures without the need for a private key. In contrast, the Diffie-Hellman functions correctly reject the point at infinity.
Users can upgrade to mirage-crypto-ec version 2.2.0 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 9, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://osv.dev/vulnerability/OSEC-2026-13 | CISA-ADP | AdvisoryExploitRemedy |
| https://osv.dev/vulnerability/OSEC-2026-13 | [email protected] | AdvisoryExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-295 | Improper Certificate Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mirage-crypto-ec | < 2.2.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 9, 2026 | New CVE Received | [email protected] |