CVE-2026-73147
Description
A flaw was found in svxlink's reflector client. The talker_start and talker_stop event handlers directly concatenate a server-supplied talker callsign into Tcl_Eval commands without any sanitization or escaping. A malicious or compromised reflector server can supply a crafted callsign containing TCL metacharacters to achieve arbitrary OS command execution with the privileges of the svxlink process.
Statement
svxlink is not shipped in any Red Hat Enterprise product. It is available in Fedora as a community-maintained package.
Mitigation
Update svxlink to version 26.05.1 or later.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Files or Directories; Read Application Data
The injected code could access restricted data / files.
Access Control
Technical Impact: Bypass Protection Mechanism
In some cases, injectable code controls authentication; this may lead to a remote vulnerability.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Injected code can access resources that the attacker is directly prevented from accessing.
Integrity,Confidentiality,Availability,Other
Technical Impact: Execute Unauthorized Code or Commands
Code injection attacks can lead to loss of data integrity in nearly all cases as the control-plane data injected is always incidental to data recall or writing. Additionally, code injection can often result in the execution of arbitrary code or at least modify what code can be executed.
Non-Repudiation
Technical Impact: Hide Activities
Often the actions performed by injected control code are unlogged.
Frequently Asked Questions
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