Vulnerability · Published Aug 3, 2026 · Assigned by GitHub_M
CVE-2026-48113Chisel: ACL Bypass via Post-Handshake SSH Channel ExtraData Injection
High 8.5
In plain English
A high-severity incorrect authorization in chisel from jpillora. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/jpillora/chisel | 1.11.5 | GHSA-24fp-5v3p-rvpw |
| Go | github.com/jpillora/chisel | 1.11.5 | GO-2026-5054 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/SA:L