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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
jpillora chisel affected
Version Status Constraints
< 1.11.5 affected —

No data.

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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
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/jpillora/chisel/commit/44310b65667a97901874ffdf4815b3732c22eaa3 cve-icon
https://github.com/jpillora/chisel/security/advisories/GHSA-24fp-5v3p-rvpw cve-icon
History

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-03T21:05:14.179Z

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

Link: CVE-2026-48113

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T22:30:02Z

Weaknesses