What’s Vulnerable › Vulnerabilities

CVE-2026-48113: Chisel: ACL Bypass via Post-Handshake SSH Channel ExtraData Injection

• Severity: high (CVSS 8.5 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-03 · updated 2026-10-23
• Weakness: CWE-863

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 products

• jpillora chisel: before 1.11.5

References

• https://github.com/jpillora/chisel/commit/44310b65667a97901874ffdf4815b3732c22eaa3
• https://github.com/jpillora/chisel/security/advisories/GHSA-24fp-5v3p-rvpw
• https://github.com/jpillora/chisel/security/advisories/GHSA-24fp-5v3p-rvpw

Get alerted when CVE-2026-48113 or the next vulnerability affects your stack