What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-20

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

• signalwire freeswitch: before 1.11.0 — fixed in 1.11.0

How to fix

Upgrade to a fixed version: signalwire freeswitch 1.11.0. Check the vendor advisory for mitigations.

References

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

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