signalwire FreeSWITCH up to 1.11.0 verto.punt improper authentication

Summaryinfo

A vulnerability described as critical has been identified in signalwire FreeSWITCH up to 1.11.0. The affected element is the function verto.punt. Executing a manipulation can lead to improper authentication. This vulnerability is tracked as CVE-2026-49843. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in signalwire FreeSWITCH up to 1.11.0. This vulnerability affects the function verto.punt. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect availability. CVE summarizes:

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-49843 since 06/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 1.11.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• signalwire

Name

• FreeSWITCH

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11.0

Website

• Product: https://github.com/signalwire/freeswitch/

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Once again VulDB remains the best source for vulnerability data.

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