CVE-2026-9079
Estado: ModificadaCrítica (9.8)—
libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.58%
- Percentil entre todas las CVEs puntuadas: 46
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1552Unsecured Credentialscredential access90 % - Impacto secundario
T1078Valid Accountsstealth · persistence · privilege escalation · initial access75 %
Vector CVSS red sin autenticación (AV:N/PR:N/UI:N) → T1190. Credenciales proxy no borradas se reutilizan en transferencias posteriores, exponiendo secretos (T1552) y posibilitando acceso no autorizado (T1078).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-522
- CWE-522
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-9079",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-9079",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-07-06T16:49:15.639683Z"
}
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 9.8,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"affectedData": [
{
"vendor": "curl",
"product": "curl",
"versions": [
{
"status": "affected",
"version": "8.8.0",
"lessThan": "8.14.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "8.15.0",
"lessThan": "8.16.1",
"versionType": "semver"
},
{
"status": "affected",
"version": "8.17.0",
"lessThan": "8.20.1",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
},
{
"repo": "https://github.com/curl/curl.git",
"vendor": "curl",
"product": "curl",
"versions": [
{
"status": "affected",
"version": "d5e83eb745762f48d8fafadc5df5dd3ae8d8941e",
"lessThan": "88c7e16cceec816a2df45c899d49b1e85513f193",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "curl",
"product": "curl",
"versions": [
{
"status": "affected",
"version": "8.20.0"
},
{
"status": "affected",
"version": "8.19.0"
},
{
"status": "affected",
"version": "8.18.0"
},
{
"status": "affected",
"version": "8.17.0"
},
{
"status": "affected",
"version": "8.16.0"
},
{
"status": "affected",
"version": "8.15.0"
},
{
"status": "affected",
"version": "8.14.1"
},
{
"status": "affected",
"version": "8.14.0"
},
{
"status": "affected",
"version": "8.13.0"
},
{
"status": "affected",
"version": "8.12.1"
},
{
"status": "affected",
"version": "8.12.0"
},
{
"status": "affected",
"version": "8.11.1"
},
{
"status": "affected",
"version": "8.11.0"
},
{
"status": "affected",
"version": "8.10.1"
},
{
"status": "affected",
"version": "8.10.0"
},
{
"status": "affected",
"version": "8.9.1"
},
{
"status": "affected",
"version": "8.9.0"
},
{
"status": "affected",
"version": "8.8.0"
}
],
"defaultStatus": "unaffected"
}
]
}
],
"published": "2026-07-03T07:16:25.620",
"references": [
{
"url": "https://curl.se/docs/CVE-2026-9079.html",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://curl.se/docs/CVE-2026-9079.json",
"tags": [
"Vendor Advisory"
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://hackerone.com/reports/3750295",
"tags": [
"Exploit",
"Issue Tracking",
"Third Party Advisory"
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://hackerone.com/reports/3750295",
"tags": [
"Exploit",
"Issue Tracking",
"Third Party Advisory"
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"description": [
{
"lang": "en",
"value": "CWE-522"
}
]
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-522"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "libcurl had a flaw that when instructed to clear proxy authentication\ncredentials which made it not do so, leaving the old credentials around to get\nused for subsequent transfers that should not know nor use them."
}
],
"lastModified": "2026-09-15T07:16:34.597",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9238ECE6-3CA5-48A9-B558-DF2BC6CE04AD",
"versionEndExcluding": "8.21.0",
"versionStartIncluding": "8.8.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"
}