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.
Published: 2026-08-03
Score: 8.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-24fp-5v3p-rvpw Chisel has an ACL Bypass via Post-Handshake SSH Channel ExtraData Injection
History

Tue, 04 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 03 Aug 2026 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Jpillora
Jpillora chisel
Vendors & Products Jpillora
Jpillora chisel

Mon, 03 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
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.
Title Chisel: ACL Bypass via Post-Handshake SSH Channel ExtraData Injection
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 8.5, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-04T17:04:25.711Z

Reserved: 2026-05-20T18:46:58.289Z

Link: CVE-2026-48113

cve-icon Vulnrichment

Updated: 2026-08-04T17:04:04.304Z

cve-icon NVD

Status : Received

Published: 2026-08-03T21:16:39.597

Modified: 2026-08-04T18:16:52.293

Link: CVE-2026-48113

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-04T20:45:03Z

Weaknesses