{"@context":"https://openvex.dev/ns/v0.2.0","@id":"https://database.harborguard.co/cve/CVE-2026-49840/vex.json","author":"HarborGuard Database","role":"Document Creator","timestamp":"2026-06-09T17:00:21.313Z","version":1,"tooling":"HarborGuard Database (https://database.harborguard.co)","statements":[{"vulnerability":{"name":"CVE-2026-49840","@id":"https://www.cve.org/CVERecord?id=CVE-2026-49840","description":"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, esl_recv_event() parses Content-Length with atol() and passes the result straight to malloc(len + 1) with no sign or magnitude check. A malicious or man-in-the-middle ESL peer can send a frame with a negative Content-Length to corrupt the heap of, or crash, any process linked against libesl,"},"products":[{"@id":"cpe:2.3:a:signalwire:freeswitch:\\<_1.11.1:*:*:*:*:*:*:*","identifiers":{"cpe23":"cpe:2.3:a:signalwire:freeswitch:\\<_1.11.1:*:*:*:*:*:*:*"}}],"status":"affected","action_statement":"No fixed version is published yet; monitor the upstream advisory.","timestamp":"2026-06-09T17:00:21.313Z"}]}