CVE-2026-48113
HighCVSS 8.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
Chisel is a TCP/UDP tunnel over HTTP secured via SSH. In versions prior to 1.11.5, authenticated clients can bypass --authfile ACL restrictions and tunnel traffic to arbitrary destinations reachable from the server. The ACL is enforced only during the initial handshake, but not on subsequent SSH channels carrying actual traffic.
Risk Assessment
A malicious client can authenticate with a permitted remote, then open channels to any host:port, allowing unauthorized access to internal network resources.
Recommendation
Immediately upgrade to version 1.11.5, which contains the fix for this vulnerability.
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Original NVD description (English source)
Chisel is a TCP/UDP tunnel, transported over HTTP and secured via SSH. In versions prior to 1.11.5, authenticated clients can bypass --authfile ACL restrictions and tunnel traffic to arbitrary destinations reachable from the server. The ACL is enforced only during the initial handshake against declared remotes, but never on subsequent SSH channels that carry actual traffic. A malicious client can authenticate with a permitted remote, then open channels to any host:port it wants. This issue has been fixed in version 1.11.5.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

