CVE-2026-58471

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When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response."}, {"lang": "es", "value": "GNU Wget hasta 1.25.0, corregido en el commit c2640fe, contiene una vulnerabilidad de desbordamiento de b\u00fafer de pila en la funci\u00f3n convert_fname() dentro de src/url.c que permite a atacantes remotos desencadenar corrupci\u00f3n de memoria a trav\u00e9s de un nombre de archivo proporcionado por el servidor que requiere conversi\u00f3n de conjunto de caracteres. Cuando el b\u00fafer de salida es demasiado peque\u00f1o durante la reasignaci\u00f3n iconv E2BIG, la l\u00f3gica de reasignaci\u00f3n calcula err\u00f3neamente el espacio restante, lo que lleva a un desbordamiento de b\u00fafer de pila que puede ser explotado a trav\u00e9s de una respuesta de servidor creada maliciosamente."}], "id": "CVE-2026-58471", "lastModified": "2026-10-25T20:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.2, "source": "disclosure@vulncheck.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "baseSeverity": "MEDIUM", "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": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58471", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-07T20:32:14.930000Z", "version": "2.0.3"}}]}, "published": "2026-07-07T21:17:28.710", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Patch"], "url": "https://gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee"}, {"source": "disclosure@vulncheck.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/gnu-wget-heap-buffer-overflow-via-convert-fname-in-url-c"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{"bugzilla": {"description": "wget: GNU Wget: Heap buffer overflow via server-supplied filename leads to memory corruption", "id": "2497850", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497850"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.", "A flaw was found in GNU Wget. A remote attacker can exploit a heap buffer overflow vulnerability in the convert_fname() function. This occurs when processing a server-supplied filename that requires character set conversion, leading to memory corruption due to incorrect buffer reallocation. This can result in a denial of service or other impacts."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, always use the -O (or --output-document) flag in your scripts to explicitly define the local filename. This forces wget to ignore the server's provided filename, completely bypassing the vulnerable code path."}, "name": "CVE-2026-58471", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "wget", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "wget", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "wget", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "wget", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "wget", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-07T19:47:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-58471\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-58471\nhttps://gitlab.com/gnuwget/wget/-/commit/c2640fe5171c59f87c58dc9fcb195b2d18b010ee\nhttps://www.vulncheck.com/advisories/gnu-wget-heap-buffer-overflow-via-convert-fname-in-url-c"], "statement": "Moderate: A heap buffer overflow in GNU Wget, affecting Red Hat Enterprise Linux and other products, can be triggered by a remote attacker. This flaw occurs when `wget` processes a specially crafted server-supplied filename that requires character set conversion, leading to memory corruption. Successful exploitation requires user interaction with a malicious server and could result in a denial of service or potentially other impacts.", "threat_severity": "Moderate"}

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