Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freeswitch | Freeswitch | < 1.11.1 |
Related Weaknesses (CWE)
References
- https://github.com/signalwire/freeswitch/releases/tag/v1.11.1Release Notes
- https://github.com/signalwire/freeswitch/security/advisories/GHSA-2v74-pcgh-75wgThird Party Advisory
FAQ
What is CVE-2026-49847?
CVE-2026-49847 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-49847?
CVE-2026-49847 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49847?
Check the references section above for vendor advisories and patch information. Affected products include: Freeswitch Freeswitch.