JuneAndGreen sm-crypto up to 0.3.x 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 labeled as problematic has been found in JuneAndGreen sm-crypto up to 0.3.x. This impacts an unknown function of the component SM2 Signed Message Handler. Such manipulation leads to signature verification. This vulnerability is documented as CVE-2026-23965. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in JuneAndGreen sm-crypto up to 0.3.x. It has been rated as problematic. Affected by this issue is an unknown part of the component SM2 Signed Message Handler. The manipulation with an unknown input leads to a signature verification vulnerability. Using CWE to declare the problem leads to CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. Impacted is integrity. CVE summarizes:

sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. A signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto prior to version 0.4.0. Under default configurations, an attacker can forge valid signatures for arbitrary public keys. If the message space contains sufficient redundancy, the attacker can fix the prefix of the message associated with the forged signature to satisfy specific formatting requirements. Version 0.4.0 patches the issue.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-23965 since 01/19/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.4.0 eliminates this vulnerability. Applying the patch 85295a859d0766222d12ce2be3e6fce7b438b510 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

Name

Version

License

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 0.4.0
Patch: 85295a859d0766222d12ce2be3e6fce7b438b510

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-hpwg-xg7m-3p6m
Status: Confirmed

CVE: CVE-2026-23965 (🔒)
GCVE (CVE): GCVE-0-2026-23965
GCVE (VulDB): GCVE-100-342296

Entryinfo

Created: 01/22/2026 08:13
Changes: 01/22/2026 08:13 (66)
Complete: 🔍
Cache ID: 216::103

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