UltrafastSecp256k1: ECDSA adaptor verification accepts non-adaptable pre-signatures due to missing DLEQ binding

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55174
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-30 16:17:31 UTC
Updated2026-09-30 20:17:33 UTC
DescriptionUltrafastSecp256k1 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 And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-345 | CWE-347 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Shrec UltrafastSecp256k1 affected < 4.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/shrec/UltrafastSecp256k1/commit/5478ef566c6af91b48a45c0c61f16... [email protected] github.com
github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.1 [email protected] github.com
github.com/shrec/UltrafastSecp256k1/releases/tag/v4.2.0 [email protected] github.com
github.com/shrec/UltrafastSecp256k1/security/advisories/GHSA-c7q2-gv3g-rgxm 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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