CVE Catalog

CVE-2026-55174

MediumCVSS 5.9
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.17%

6th percentile - higher than 6% of all known CVEs

Summary

UltrafastSecp256k1 is a high-performance, multi-backend secp256k1 engine with reproducible audit evidence, compatibility shims, and profile-based review scopes. Prior to version 4.2.0, UltrafastSecp256k1's ECDSA adaptor pre-signature verification accepts forged adaptor pre-signatures whose "r" value is not cryptographically bound to the adaptor point "T". This issue has been patched in version 4.2.0.

Risk Assessment

An attacker could forge ECDSA adaptor pre-signatures, potentially bypassing cryptographic mechanisms and leading to transaction or signature forgery. This may undermine trust in systems relying on this engine.

Recommendation

Upgrade UltrafastSecp256k1 to version 4.2.0 or later. Verify signature integrity in systems using this engine.

Related vulnerabilities

Original NVD description (English source)

UltrafastSecp256k1 is a high-performance, multi-backend secp256k1 engine with reproducible audit evidence, compatibility shims, and profile-based review scopes. Prior to version 4.2.0, UltrafastSecp256k1's ECDSA adaptor pre-signature verification accepts forged adaptor pre-signatures whose "r" value is not cryptographically bound to the adaptor point "T". This issue has been patched in version 4.2.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS