CVE-2026-81535 wolfSSH - Authorization Bypass

wolfSSH through 1.5.0 built with --enable-fwd contains an authorization bypass caused by missing checks on forwarded-tcpip channel opens in DoChannelOpen(), letting malicious SSH peers allocate unbounded buffers and open unauthorized forwarding channels, exploit requires SSH session with forwarding enabled.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Denial Of Service, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
7 October 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to the latest version with proper authorization checks on forwarded-tcpip channels.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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