{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-49842: FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-49842","status":"final","version":"1","initial_release_date":"2026-06-09T16:02:58.096Z","current_release_date":"2026-06-09T18:39:33.710Z","revision_history":[{"date":"2026-06-09T16:02:58.096Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-49842 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-49842"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-49842"},{"category":"external","summary":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35","url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-p3gx-p2w7-wp35"},{"category":"external","summary":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1","url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1"}]},"product_tree":{"branches":[{"category":"vendor","name":"signalwire","branches":[{"category":"product_name","name":"freeswitch","branches":[{"category":"product_version","name":"< 1.11.1","product":{"name":"signalwire freeswitch < 1.11.1","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:signalwire:freeswitch:\\<_1.11.1:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-49842","title":"FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}