Vulnerability-Lookup

GHSA-HPWG-XG7M-3P6M

Vulnerability from github – Published: 2026-01-21 16:13 – Updated: 2026-01-22 15:43

Summary

sm-crypto Affected by Signature Forgery in SM2-DSA

Details

Summary

A signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto. 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.

Credit

This vulnerability was discovered by: - XlabAI Team of Tencent Xuanwu Lab - Atuin Automated Vulnerability Discovery Engine

Severity

7.5 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "sm-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23965"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-21T16:13:44Z",
    "nvd_published_at": "2026-01-22T03:15:46Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA signature forgery vulnerability exists in the SM2 signature verification logic of sm-crypto. 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.\n\n### Credit\n\nThis vulnerability was discovered by:\n- XlabAI Team of Tencent Xuanwu Lab\n- Atuin Automated Vulnerability Discovery Engine",
  "id": "GHSA-hpwg-xg7m-3p6m",
  "modified": "2026-01-22T15:43:29Z",
  "published": "2026-01-21T16:13:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-hpwg-xg7m-3p6m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23965"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JuneAndGreen/sm-crypto/commit/85295a859d0766222d12ce2be3e6fce7b438b510"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/JuneAndGreen/sm-crypto"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sm-crypto Affected by Signature Forgery in SM2-DSA"
}

CVE-2026-23965 (GCVE-0-2026-23965)

Vulnerability from cvelistv5 – Published: 2026-01-22 02:05 – Updated: 2026-01-22 15:58

Title

sm-crypto Affected by Signature Forgery in SM2-DSA

Summary

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.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-22 15:57 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/JuneAndGreen/sm-crypto/securit…	x_refsource_CONFIRM
https://github.com/JuneAndGreen/sm-crypto/commit/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
JuneAndGreen	sm-crypto	Affected: < 0.4.0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23965",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-22T15:57:36.387701Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-22T15:58:10.585Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "sm-crypto",
          "vendor": "JuneAndGreen",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.4.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
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      "providerMetadata": {
        "dateUpdated": "2026-01-22T02:05:43.426Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-hpwg-xg7m-3p6m",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-hpwg-xg7m-3p6m"
        },
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/JuneAndGreen/sm-crypto/commit/85295a859d0766222d12ce2be3e6fce7b438b510"
        }
      ],
      "source": {
        "advisory": "GHSA-hpwg-xg7m-3p6m",
        "discovery": "UNKNOWN"
      },
      "title": "sm-crypto Affected by Signature Forgery in SM2-DSA"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2026-01-22T02:05:43.426Z",
    "dateReserved": "2026-01-19T14:49:06.314Z",
    "dateUpdated": "2026-01-22T15:58:10.585Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-HPWG-XG7M-3P6M

Summary

Credit

CVE-2026-23965 (GCVE-0-2026-23965)

Tags

Sightings

Nomenclature

Related by attack behaviour