CVE-2026-56392

{"id": "CVE-2026-56392", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56392", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-24T12:32:03.340535Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.2, "exploitabilityScore": 1.8}], "cvssMetricV40": [{"type": "Secondary", "source": "cvd@cert.pl", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 1.8, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cvd@cert.pl", "affectedData": [{"vendor": "GNU", "modules": ["unexpand"], "product": "coreutils", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "9.11"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-24T09:16:25.147", "references": [{"url": "https://cert.pl/en/posts/2026/07/CVE-2026-56391", "tags": ["Third Party Advisory"], "source": "cvd@cert.pl"}, {"url": "https://git.savannah.gnu.org/cgit/coreutils.git/", "tags": ["Product"], "source": "cvd@cert.pl"}, {"url": "https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d", "tags": ["Patch"], "source": "cvd@cert.pl"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cvd@cert.pl", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer.\nWhen processing crafted input, subsequent writes exceed the allocated memory, leading to an out\u2011of\u2011bounds heap write.\n\nWhen running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout.\n\n\n\n\n\n\n\n\n\n\nThis issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d"}, {"lang": "es", "value": "GNU coreutils unexpand es vulnerable a un desbordamiento de b\u00fafer basado en mont\u00edculo debido a un desbordamiento de entero durante la asignaci\u00f3n de b\u00fafer al procesar valores grandes de tabulaci\u00f3n (-t). La multiplicaci\u00f3n utilizada para calcular el tama\u00f1o de la asignaci\u00f3n puede dar la vuelta, lo que resulta en un b\u00fafer de tama\u00f1o insuficiente.\nAl procesar entrada manipulada, las escrituras subsiguientes exceden la memoria asignada, lo que lleva a una escritura fuera de l\u00edmites en el mont\u00edculo.\n\nAl ejecutar GNU coreutils unexpand con argumentos de tabulaci\u00f3n (-t) grandes proporcionados por el atacante, este comportamiento lleva a un fallo y potencialmente logra una primitiva de escritura en el mont\u00edculo dependiendo del dise\u00f1o de la memoria.\n\nEste problema ha sido corregido en el commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d"}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:coreutils:9.11:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CF7549B0-7C5E-4B29-969D-B9FC81E6F671"}], "operator": "OR"}]}], "sourceIdentifier": "cvd@cert.pl"}