CVE-2026-49475: FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
FreeSWITCHto a version that resolves this vulnerability.Fixed in 1.11.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-49475?
CVE-2026-49475 has a severity rating of high with a score of 7.5.
How do I fix CVE-2026-49475?
To fix CVE-2026-49475, upgrade to FreeSWITCH version 1.11.0 or later.
What vulnerabilities does CVE-2026-49475 address?
CVE-2026-49475 addresses an out-of-bounds memory access issue in core STUN attribute parsing in FreeSWITCH.
Which versions of FreeSWITCH are affected by CVE-2026-49475?
CVE-2026-49475 affects FreeSWITCH versions prior to 1.11.0.
What type of vulnerability is CVE-2026-49475 classified as?
CVE-2026-49475 is classified as an Input Validation vulnerability.