Vulnerability · Published Jun 9, 2026 · Assigned by GitHub_M

CVE-2026-49475FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing

High 7.5

In plain English

A high-severity improper input validation in freeswitch from signalwire. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 79.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser casts to causes the parser to read and write past the end of the attribute, producing an out-of-bounds memory access on the per-leg media buffer. This issue has been patched in version 1.11.0.

Affected products (as reported)

Vendor	Product	Versions
signalwire	freeswitch	< 1.11.0

Weakness: CWE-20, CWE-125, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/signalwire/freeswitch/security/advisories/GHSA-9j6h-hc95-q926 x_refsource_CONFIRM
https://github.com/signalwire/freeswitch/releases/tag/v1.11.0 x_refsource_MISC