CVE-2026-48113 Chisel: ACL Bypass via Post-Handshake SSH Channel ExtraData Injection
Authenticated clients can bypass ACL restrictions to tunnel traffic to arbitrary destinations due to missing authorization checks on subsequent SSH channels.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48113?
CVE-2026-48113 is a high-severity missing authorization vulnerability in jpillora chisel, published on 3 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-48113?
3 open source packages ship an affected version, including github.com/jpillora/chisel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/jpillora/chisel Go | All versions | 1.11.5 |
github.com/jpillora/chisel Go | All versions | 1.11.5 |
github.com/jpillora/chisel Go | All versions | 1.11.5 |
How do I fix CVE-2026-48113?
Upgrade github.com/jpillora/chisel to 1.11.5 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48113 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48113 exists.
Sources
Also known as GHSA-24fp-5v3p-rvpw, GO-2026-5054.