Resource exhaustion in Freeswitch
CVE-2026-49842
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 1.11.1, mod_verto's WebSocket frame loop intercepts a #-prefixed speed-test protocol (#SPU / #SPB / #SPE) before any authentication check. The declared payload size in #SPU was parsed with atoi() and only rejected non-positive values, so an unauthenticated peer could request up to INT_MAX bytes. The server then wrote roughly size * 10 bytes back during the download phase, on the order of 20 GB per request, yielding strong outbound bandwidth amplification from a short request. This issue has been patched in version 1.11.1.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001
Affected products
- Freeswitch
- Signalwire Freeswitch — versions < 1.11.1
Weakness classification (CWE)
References
- github.com/signalwire/freeswitch/releases/tag/v1.11.1 (Release Notes)
- github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35 (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-49842?
- CVE-2026-49842 is a high-severity vulnerability in Freeswitch, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-09.
- How severe is CVE-2026-49842?
- High severity. CVSS v3 base score is 7.5 out of 10.