Medium severity5.9NVD Advisory· Published Sep 30, 2026

CVE-2026-55174

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Shrec/Ultrafastsecp256k1references2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: <4.2.0

Patches

Vulnerability mechanics

References

github.com/shrec/UltrafastSecp256k1/commit/5478ef566c6af91b48a45c0c61f161f5b1071981nvd
github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.0nvd
github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.1nvd
github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxmnvd

News mentions

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cvss	0.384
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000