CVE-2026-116787
Dashboard / Vulnerabilities / CVE-2026-116787
Summary: FreeSWITCH: Pre-authentication process termination in the Event Socket via an unbounded Content-Length
Details: 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 1.11.2, mod_event_socket used an unauthenticated Content-Length value directly as the allocation size for an Event Socket message body. Negative or extremely large values could overflow the terminator calculation or force an allocation failure through a helper that aborts the FreeSWITCH process. The header is parsed before the Event Socket password, so any host admitted by apply-inbound-acl can trigger termination with its first packet; the default loopback ACL limits ordinary installations to local clients. The outbound socket dialplan path is also affected when FreeSWITCH connects to a hostile application server, and process termination drops every active call until the service is restarted. This issue is fixed in version 1.11.2.
References: https://github.com/signalwire/freeswitch/releases/tag/v1.11.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116787.json, https://github.com/signalwire/freeswitch/security/advisories/GHSA-j27c-m99r-8pc3, https://nvd.nist.gov/vuln/detail/CVE-2026-116787, https://github.com/signalwire/freeswitch/commit/a097e124213c164845dcaaa8feed2e70bc1e7191
Affected packages
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