Is CVE-2026-49842 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-49842 being exploited in the wild.

How severe is CVE-2026-49842?

High severity, with a CVSS score of 7.5, published 9 June 2026.

Which products and versions are affected?

SignalWire FreeSWITCH < 1.11.1.

Is there a fix for CVE-2026-49842?

A patch was published on 2026-05-26: Version 1.11.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-49842 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-49842?

Check whether you run SignalWire FreeSWITCH at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-49842: SignalWire FreeSWITCH bandwidth amplification in mod_verto

Q: Is there a fix for CVE-2026-49842?

A patch was published on 2026-05-26: Version 1.11.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-49842 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-49842?

Check whether you run SignalWire FreeSWITCH at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-49842 · Severity: high · CVSS 7.5 · Published 2026-06-09

FreeSWITCH, a software-based telecommunications platform, contains a flaw in its WebSocket communication module. An unauthenticated attacker can send a small, specially crafted request that forces the server to respond with massive amounts of data (up to 20 GB). This can saturate the server's internet connection and exhaust system resources, leading to a total service outage for legitimate users.

Technologies: SignalWire FreeSWITCH. Vendors: SignalWire.

Quick answers

Is CVE-2026-49842 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-49842 being exploited in the wild.
How severe is CVE-2026-49842?: High severity, with a CVSS score of 7.5, published 9 June 2026.
Which products and versions are affected?: SignalWire FreeSWITCH < 1.11.1.
Is there a fix for CVE-2026-49842?: A patch was published on 2026-05-26: Version 1.11.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-49842 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-49842?: Check whether you run SignalWire FreeSWITCH at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability exists in the mod_verto module's WebSocket frame loop where speed-test protocol commands (#SPU, #SPB, #SPE) are processed before authentication. The payload size in the #SPU command is parsed using atoi() without upper-bound validation, allowing an unauthenticated peer to request up to INT_MAX bytes. The server responds by writing approximately 10 times the requested size back to the client, potentially generating 20 GB of outbound traffic from a single small request. This results in significant bandwidth amplification and resource exhaustion. The issue is fixed in version 1.11.1 by requiring authentication for speed-test commands and capping the maximum size to 10 MiB.

Affected products

SignalWire FreeSWITCH < 1.11.1

Timeline

2026-05-26: patched: Version 1.11.1 released
2026-06-03: advisory: GitHub Security Advisory published
2026-06-09: disclosed: CVE published to NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.