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PatchSiren cyber security CVE debrief

CVE-2026-49842 signalwire CVE debrief

CVE-2026-49842 is a HIGH-severity vulnerability in FreeSWITCH mod_verto. Prior to version 1.11.1, the WebSocket frame loop intercepts a #-prefixed speed-test protocol (#SPU / #SPB / #SPE) before any authentication check. An unauthenticated peer could request up to INT_MAX bytes, causing the server to write roughly size * 10 bytes back during the download phase, resulting in strong outbound bandwidth amplification from a short request.

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 mod_verto prior to version 1.11.1 should apply the patch to prevent exploitation.

Technical summary

The vulnerability exists in the mod_verto WebSocket frame loop, which intercepts #-prefixed speed-test protocols before authentication. The declared payload size in #SPU was parsed with atoi() and only rejected non-positive values, allowing an unauthenticated peer to request up to INT_MAX bytes.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to FreeSWITCH version 1.11.1 or later.
  • Refer to [ref-4](https://github.com/signalwire/freeswitch/releases/tag/v1.11.1) for release notes.
  • Refer to [ref-5](https://github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35) for additional information.

Evidence notes

The CVE-2026-49842 record was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-49842). The vulnerability details were obtained from [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-49842).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49842 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49842

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

  • CVE-2026-49842 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49842

    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.