CVE-2026-22698

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{"affected": [{"affectedData": [{"product": "elliptic-curves", "vendor": "RustCrypto", "versions": [{"status": "affected", "version": "= 0.14.0-pre.0"}, {"status": "affected", "version": "= 0.14.0-rc.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rustcrypto:sm2_elliptic_curve:0.14.0:pre0:*:*:*:rust:*:*", "matchCriteriaId": "5F5BCFE9-1585-4A90-857F-7F9E1B9C9ADA", "vulnerable": true}, {"criteria": "cpe:2.3:a:rustcrypto:sm2_elliptic_curve:0.14.0:rc0:*:*:*:rust:*:*", "matchCriteriaId": "B584C50F-8ED4-45F4-8799-7CCFE8D4DF66", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "RustCrypto: Elliptic Curves is general purpose Elliptic Curve Cryptography (ECC) support, including types and traits for representing various elliptic curve forms, scalars, points, and public/secret keys composed thereof. In versions 0.14.0-pre.0 and 0.14.0-rc.0, a critical vulnerability exists in the SM2 Public Key Encryption (PKE) implementation where the ephemeral nonce k is generated with severely reduced entropy. A unit mismatch error causes the nonce generation function to request only 32 bits of randomness instead of the expected 256 bits. This reduces the security of the encryption from a 128-bit level to a trivial 16-bit level, allowing a practical attack to recover the nonce k and decrypt any ciphertext given only the public key and ciphertext. This issue has been patched via commit e4f7778."}, {"lang": "es", "value": "RustCrypto: Curvas El\u00edpticas es soporte de Criptograf\u00eda de Curva El\u00edptica (ECC) de prop\u00f3sito general, incluyendo tipos y rasgos para representar varias formas de curvas el\u00edpticas, escalares, puntos y claves p\u00fablicas/secretas compuestas de ellos. En las versiones 0.14.0-pre.0 y 0.14.0-rc.0, existe una vulnerabilidad cr\u00edtica en la implementaci\u00f3n de Cifrado de Clave P\u00fablica (PKE) SM2 donde el nonce ef\u00edmero k se genera con una entrop\u00eda severamente reducida. Un error de desajuste de unidades hace que la funci\u00f3n de generaci\u00f3n de nonce solicite solo 32 bits de aleatoriedad en lugar de los 256 bits esperados. Esto reduce la seguridad del cifrado de un nivel de 128 bits a un nivel trivial de 16 bits, permitiendo un ataque pr\u00e1ctico para recuperar el nonce k y descifrar cualquier texto cifrado dado solo la clave p\u00fablica y el texto cifrado. Este problema ha sido parcheado a trav\u00e9s del commit e4f7778."}], "id": "CVE-2026-22698", "lastModified": "2026-06-17T10:20:15.333", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-22698", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-12T16:47:49.756087Z", "version": "2.0.3"}}]}, "published": "2026-01-10T06:15:52.220", "references": [{"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://crates.io/crates/sm2/0.14.0-pre.0"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://crates.io/crates/sm2/0.14.0-rc.0"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/RustCrypto/elliptic-curves/pull/1600"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-331"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T07:11:59.300780+00:00", "value": {"mitigation_remediation": ["Upgrade the RustCrypto elliptic\u2011curves crate to a fixed version that includes the e4f7778 patch, such as 0.14.0\u2011rc.1 or later.", "If an immediate upgrade is impossible, manually apply the patch from commit e4f7778 to your local copy of the crate and rebuild the application.", "After applying the patch, verify that the nonce generation routine uses a full 256\u2011bit random source by checking the source or running unit tests that confirm a reduced\u2011bias nonce can no longer be recovered."], "summary": {"action": "Patch Now", "impact": "Confidentiality Breach (decryption of ciphertext)"}, "threat_synthesis": {"affected_systems": "Impact is limited to two pre\u2011release versions of the RustCrypto elliptic\u2011curves crate: 0.14.0\u2011pre.0 and 0.14.0\u2011rc.0. Systems that depend on these releases for SM2\u2011PKE functionality are affected, while later stabilized releases are presumed patched.", "description_and_impact": "The SM2 Public Key Encryption implementation in RustCrypto Elliptic Curves mistakenly generates a 32\u2011bit nonce instead of the required 256 bits due to a unit mismatch. This severe entropy reduction collapses the expected 128\u2011bit security to a trivial 16\u2011bit level, making it practical for an attacker to recover the nonce and decrypt any ciphertext that has been encrypted with a public key. The vulnerability is classified as CWE\u2011331, a random number weakness that undermines cryptographic security.", "risk_and_exploitability": "With a CVSS score of 8.7 the vulnerability is considered high severity, yet an EPSS score of\u202f<\u202f1\u202f% suggests that the likelihood of exploitation is currently low. It is not listed in the CISA KEV catalog. Attackers would need only the ciphertext and the public key; they can brute\u2011force the 16\u2011bit nonce space to recover the secret key or decrypt the message. The exploit requires no special privilege or privileged access and can be performed remotely by an external actor who can capture or generate ciphertexts. Entities that send or receive SM2\u2011PKE encrypted data should therefore prioritize remediation."}}}}, "created": "2026-01-12T14:36:56.305997+00:00", "updated": "2026-04-18T07:15:25.857949+00:00", "vendors": ["rustcrypto", "rustcrypto$PRODUCT$elliptic-curves"]}