JuneAndGreen sm-crypto up to 0.3.13 SM2 Signed Message signature verification

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in JuneAndGreen sm-crypto up to 0.3.13. Affected is an unknown function of the component SM2 Signed Message Handler. Executing a manipulation can lead to signature verification. This vulnerability is handled as CVE-2026-23967. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in JuneAndGreen sm-crypto up to 0.3.13. It has been declared as problematic. This vulnerability affects an unknown function of the component SM2 Signed Message Handler. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect integrity. CVE summarizes:

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature malleability vulnerability exists in the SM2 signature verification logic of the sm-crypto library prior to version 0.3.14. An attacker can derive a new valid signature for a previously signed message from an existing signature. Version 0.3.14 patches the issue.

The advisory is available at github.com. This vulnerability was named CVE-2026-23967 since 01/19/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 0.3.14 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: sm-crypto 0.3.14

Timelineinfo

01/19/2026 CVE reserved
01/22/2026 +3 days Advisory disclosed
01/22/2026 +0 days VulDB entry created
01/22/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-qv7w-v773-3xqm
Status: Confirmed

CVE: CVE-2026-23967 (🔒)
GCVE (CVE): GCVE-0-2026-23967
GCVE (VulDB): GCVE-100-342286

Entryinfo

Created: 01/22/2026 08:06
Changes: 01/22/2026 08:06 (64)
Complete: 🔍
Cache ID: 216::103

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