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CVE-2026-49475 signalwire CVE debrief

CVE-2026-49475 is a HIGH severity vulnerability in FreeSWITCH, a Software Defined Telecom Stack. Prior to version 1.11.0, a specially crafted STUN packet can be used to cause an out-of-bounds memory access on the per-leg media buffer. This issue has been patched in version 1.11.0.

Vendor
signalwire
Product
freeswitch
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Users of FreeSWITCH prior to version 1.11.0 should update to the latest version to prevent exploitation of this vulnerability.

Technical summary

A STUN packet with a declared attribute length shorter than the structure the parser casts to can cause the parser to read and write past the end of the attribute, resulting in an out-of-bounds memory access.

Defensive priority

HIGH

Recommended defensive actions

  • Update to FreeSWITCH version 1.11.0 or later.

Evidence notes

This vulnerability has been patched in version 1.11.0. For more information, see [ref-4](https://github.com/signalwire/freeswitch/releases/tag/v1.11.0) and [ref-5](https://github.com/signalwire/freeswitch/security/advisories/GHSA-9j6h-hc95-q926).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49475 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49475

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49475 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49475

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.