CVE-2026-23965

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{"affected": [{"affectedData": [{"product": "sm-crypto", "vendor": "JuneAndGreen", "versions": [{"status": "affected", "version": "< 0.4.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:juneandgreen:sm-crypto:*:*:*:*:*:*:*:*", "matchCriteriaId": "1E895E89-0BB9-45B8-8DEF-8598D9494916", "versionEndExcluding": "0.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "sm-crypto proporciona implementaciones de JavaScript de los algoritmos criptogr\u00e1ficos chinos SM2, SM3 y SM4. Hay una vulnerabilidad de falsificaci\u00f3n de firma en la l\u00f3gica de verificaci\u00f3n de firma SM2 de sm-crypto anterior a la versi\u00f3n 0.4.0. En configuraciones predeterminadas, un atacante puede falsificar firmas v\u00e1lidas para claves p\u00fablicas arbitrarias. Si el espacio de mensajes contiene suficiente redundancia, el atacante puede fijar el prefijo del mensaje asociado con la firma falsificada para satisfacer requisitos de formato espec\u00edficos. La versi\u00f3n 0.4.0 corrige el problema."}], "id": "CVE-2026-23965", "lastModified": "2026-06-17T10:22:21.983", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23965", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-22T15:57:36.387701Z", "version": "2.0.3"}}]}, "published": "2026-01-22T03:15:46.860", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/JuneAndGreen/sm-crypto/commit/85295a859d0766222d12ce2be3e6fce7b438b510"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/JuneAndGreen/sm-crypto/security/advisories/GHSA-hpwg-xg7m-3p6m"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T03:58:28.875307+00:00", "value": {"mitigation_remediation": ["Upgrade sm-crypto to version 0.4.0 or newer.", "Replace SM2 signature verification with a vetted implementation or an alternative cryptographic library that correctly validates signatures.", "Strictly validate any externally supplied public keys and enforce that signatures are accepted only from trusted, authenticated sources."], "summary": {"action": "Apply Patch", "impact": "Signature Forgery"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all installations of the JuneAndGreen sm-crypto JavaScript library built before version 0.4.0.", "description_and_impact": "The sm-crypto library implements the Chinese SM2, SM3, and SM4 cryptographic algorithms. A flaw in the SM2 signature verification logic allows an attacker to forge a valid signature for any chosen public key. When the message space contains sufficient redundancy, the attacker can control the message prefix to match required formatting, enabling the forged signature to pass verification checks. This capability can be used to impersonate trusted parties, tamper with data, or bypass integrity checks in any application that relies on sm-crypto for signature validation.", "risk_and_exploitability": "With a CVSS score of 7.5, the flaw is considered high severity. The current EPSS score of less than 1% indicates a very low probability of exploitation at present, and it is not listed in the CISA KEV catalog. Exploitation requires that an attacker can supply both a crafted public key and a forged signature to the verification routine, which is feasible in any context where sm-crypto is invoked on external data, such as web services or client-side applications. The vulnerability does not allow arbitrary code execution but can subvert authentication or integrity mechanisms."}}}}, "created": "2026-01-22T10:08:13.005660+00:00", "updated": "2026-04-18T04:00:08.423796+00:00", "vendors": ["juneandgreen", "juneandgreen$PRODUCT$sm-crypto"]}