CVE-2026-55174: CWE-345: Insufficient Verification of Data Authenticity in shrec UltrafastSecp256k1
CVE-2026-55174 is a medium severity vulnerability in shrec's UltrafastSecp256k1 prior to version 4.2.0. The issue involves insufficient verification of data authenticity in the ECDSA adaptor pre-signature verification process, where forged adaptor pre-signatures with an "r" value not cryptographically bound to the adaptor point "T" are accepted. This flaw has been fixed in version 4.2.0.
AI Analysis
Technical Summary
UltrafastSecp256k1 is a high-performance secp256k1 engine. Before version 4.2.0, its ECDSA adaptor pre-signature verification did not properly verify that the "r" value in the adaptor pre-signature was cryptographically bound to the adaptor point "T", allowing acceptance of forged adaptor pre-signatures. This represents an insufficient verification of data authenticity (CWE-345). The vulnerability has been addressed in version 4.2.0.
Potential Impact
The vulnerability allows acceptance of forged adaptor pre-signatures, which compromises the integrity of the signature verification process. This can lead to invalid signatures being accepted, impacting the integrity of cryptographic operations. There is no impact on confidentiality or availability reported. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade to UltrafastSecp256k1 version 4.2.0 or later, where this vulnerability has been patched. No other mitigation is required as the issue is fixed in the official release.
CVE-2026-55174: CWE-345: Insufficient Verification of Data Authenticity in shrec UltrafastSecp256k1
Description
CVE-2026-55174 is a medium severity vulnerability in shrec's UltrafastSecp256k1 prior to version 4.2.0. The issue involves insufficient verification of data authenticity in the ECDSA adaptor pre-signature verification process, where forged adaptor pre-signatures with an "r" value not cryptographically bound to the adaptor point "T" are accepted. This flaw has been fixed in version 4.2.0.
CVSS v3.1
Score 5.9medium
Affected software
shrec
UltrafastSecp256k1
pkg:github/shrec/UltrafastSecp256k1Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
UltrafastSecp256k1 is a high-performance secp256k1 engine. Before version 4.2.0, its ECDSA adaptor pre-signature verification did not properly verify that the "r" value in the adaptor pre-signature was cryptographically bound to the adaptor point "T", allowing acceptance of forged adaptor pre-signatures. This represents an insufficient verification of data authenticity (CWE-345). The vulnerability has been addressed in version 4.2.0.
Potential Impact
The vulnerability allows acceptance of forged adaptor pre-signatures, which compromises the integrity of the signature verification process. This can lead to invalid signatures being accepted, impacting the integrity of cryptographic operations. There is no impact on confidentiality or availability reported. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade to UltrafastSecp256k1 version 4.2.0 or later, where this vulnerability has been patched. No other mitigation is required as the issue is fixed in the official release.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T15:20:43.085Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abd6b1e2a4e24523d869f97
Added to database: 09/30/2026, 20:03:42 UTC
Last enriched: 09/30/2026, 20:18:25 UTC
Last updated: 09/30/2026, 22:23:30 UTC
Views: 6
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