CVE Watch7 oct 2026

CVE-2026-81535

In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen() in src/internal.c gates only direct-tcpip channel opens with the forwardin

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 7 oct 2026 · Última mod.: 7 oct 2026 · CWE-862 · CWE-863

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen() in src/internal.c gates only direct-tcpip channel opens with the forwarding policy callback. forwarded-tcpip opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an endpoint allocate unbounded per-channel buffers for forwarding channels the application never authorized. A client also does not check a forwarded-tcpip open against the forwards it registered with a tcpip-forward request, as RFC 4254 section 7.2 requires, so a malicious server can open forwarding channels for addresses and ports the client never asked it to forward.

Referencias oficiales

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