EUVD-2026-74619
GHSA-5v5p-5xxr-9xf8
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Library used in network protocols accepting external EC keys; no complexity, privilege, or interaction required once attacker controls the key input.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
ECDSA signature forgery is possible in mirage-crypto-ec before 2.2.0 for OCaml because the P256, P384, and P521 pub_of_octets functions accept 0x00 - the encoding of the elliptic curve point at infinity - as a valid public key. Any application relying on this library to verify ECDSA signatures against externally-supplied public keys can be deceived into accepting signatures crafted without knowledge of any private key. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) the target application links against mirage-crypto-ec before version 2.2.0, and (2) an attacker can supply or influence the EC public key passed to pub_of_octets - for example, through externally-provided public key material in a TLS certificate, JWT header, cryptographic protocol message, or API input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, score 6.2) assigns a local attack vector, which likely reflects a conservative, application-agnostic assessment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade mirage-crypto-ec to version 2.2.0 or later, which introduces proper rejection of the point at infinity in pub_of_octets for all three affected curves (P256, P384, P521). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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