CVE-2026-42859

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{"affected": [{"affectedData": [{"product": "neatvnc", "vendor": "any1", "versions": [{"status": "affected", "version": "< 0.9.6"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Neat VNC is a VNC server library. Prior to 0.9.6, a pre-authentication stack buffer overflow exists in neatvnc in the RSA-AES security type handler. An unauthenticated remote attacker who can reach the VNC listening socket can send a crafted security type 5 (RSA-AES) or security type 129 (RSA-AES-256) handshake with an oversized client RSA public key, causing rsa_aes_send_challenge in src/auth/rsa-aes.c to overflow a 1024-byte on-stack buffer when encrypting the server challenge. This results in at least a denial of service via server crash. This vulnerability is fixed in 0.9.6."}, {"lang": "es", "value": "Neat VNC es una biblioteca de servidor VNC. Antes de la versi\u00f3n 0.9.6, existe un desbordamiento de b\u00fafer de pila de pre-autenticaci\u00f3n en neatvnc en el gestor de tipo de seguridad RSA-AES. Un atacante remoto no autenticado que puede alcanzar el socket de escucha VNC puede enviar un handshake de tipo de seguridad 5 (RSA-AES) o de tipo de seguridad 129 (RSA-AES-256) manipulado con una clave p\u00fablica RSA de cliente sobredimensionada, causando que rsa_aes_send_challenge en src/auth/rsa-aes.c desborde un b\u00fafer en pila de 1024 bytes al cifrar el desaf\u00edo del servidor. Esto resulta en al menos una denegaci\u00f3n de servicio a trav\u00e9s de un fallo del servidor. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 0.9.6."}], "id": "CVE-2026-42859", "lastModified": "2026-10-26T18:10:00.173", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "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:H/VA:H/SC:N/SI:N/SA:N/E:U/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42859", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-11T18:21:36.453865Z", "version": "2.0.3"}}]}, "published": "2026-05-11T18:16:36.400", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/any1/neatvnc/commit/1f6cd6b75cc167fed3a19a9d1552a1f662f6b337"}, {"source": "security-advisories@github.com", "url": "https://github.com/any1/neatvnc/security/advisories/GHSA-567c-gpv8-qh9h"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.9.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "neatvnc", "source": "cna", "vendor": "any1"}, "product": "neatvnc", "vendor": "any1"}], "created": "2026-05-11T19:30:06.024327+00:00", "updated": "2026-05-11T19:30:06.305105+00:00", "vendors": ["any1", "any1$PRODUCT$neatvnc"]}