High severity · published Jun 9, 2026
CVE-2026-49475
FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
freeswitch · signalwire
< 1.11.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49475
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49475
Release Notes
https://github.com/signalwire/freeswitch/releases/tag/v1.11.0
Third Party Advisory
https://github.com/signalwire/freeswitch/security/advisories/GHSA-9j6h-hc95-q926
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