High severity7.5NVD Advisory· Published Jun 9, 2026· Updated Jun 10, 2026
CVE-2026-49847
CVE-2026-49847
Description
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, a single unauthenticated WebSocket frame containing a deeply nested JSON document crashes the FreeSWITCH process via stack overflow, terminating all calls and sessions on the host. The recursion drives the worker thread's stack pointer into the stack guard page, raising SIGSEGV from the kernel before any usable write primitive develops. This issue has been patched in version 1.11.1.
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Affected products
2cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*range: <1.11.1
- (no CPE)range: <1.11.1
Patches
Vulnerability mechanics
References
2- github.com/signalwire/freeswitch/security/advisories/GHSA-2v74-pcgh-75wgnvdThird Party Advisory
- github.com/signalwire/freeswitch/releases/tag/v1.11.1nvdRelease Notes
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