signalwire FreeSWITCH up to 1.10.x XML Parser xml entity expansion

Summaryinfo

A vulnerability was found in signalwire FreeSWITCH up to 1.10.x. It has been rated as problematic. Affected by this issue is some unknown functionality of the component XML Parser. The manipulation leads to xml entity expansion. This vulnerability is uniquely identified as CVE-2026-45771. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in signalwire FreeSWITCH up to 1.10.x and classified as critical. This issue affects an unknown function of the component XML Parser. The manipulation with an unknown input leads to a xml entity expansion vulnerability. Using CWE to declare the problem leads to CWE-776. The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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 1.11.0, FreeSWITCH's bundled XML parser expands nested declarations without a depth or count bound, so a small DTD can describe a body that expands exponentially ("billion laughs"). The PIDF body of a SIP PUBLISH is fed to this parser before any digest check, letting an unauthenticated network attacker force unbounded CPU and memory consumption with a single request. This issue has been patched in version 1.11.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-45771 since 05/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.11.0 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

Website

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

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