CVE-2026-42246

Estado: ModificadaAlta (7.6)—
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.
CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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
Puntuación base: 7.6
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.31%
Percentil entre todas las CVEs puntuadas: 22
Fecha de la puntuación: 5/10/2026
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.
ExplotaciónT1557 Adversary-in-the-Middlecredential access · collection85 %
Impacto principalT1040 Network Sniffingcredential access · discovery80 %
Impacto secundarioT1555 Credentials from Password Storescredential access75 %
Atacante en el medio (CVSS AV:N, AT:P indica red adyacente) bloquea TLS en Net::IMAP, permitiendo captura de credenciales IMAP en texto plano.
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

Network Segmentation Encrypt Sensitive Information User Training User Account Management Privileged Account Management Password Policies
Tecnologías afectadas (1)

Ruby-lang — Net\
CWE

CWE-392, CWE-393, CWE-636, CWE-754, CWE-841
CWE-325
Referencias

JSON original (NVD)

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