CVE-2026-49840

{"id": "CVE-2026-49840", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49840", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-09T16:59:32.826404Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "signalwire", "product": "freeswitch", "versions": [{"status": "affected", "version": "< 1.11.1"}]}]}], "published": "2026-06-09T17:17:47.703", "references": [{"url": "https://github.com/signalwire/freeswitch/releases/tag/v1.11.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9", "tags": ["Third Party Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-195"}, {"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "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, before the client has authenticated to that peer. This issue has been patched in version 1.11.1."}, {"lang": "es", "value": "FreeSWITCH es una Pila de Telecomunicaciones Definida por Software que permite la transformaci\u00f3n digital desde conmutadores de telecomunicaciones propietarios a una implementaci\u00f3n de software que se ejecuta en cualquier hardware comercial. Antes de la versi\u00f3n 1.11.1, esl_recv_event() analiza Content-Length con atol() y pasa el resultado directamente a malloc(len + 1) sin verificaci\u00f3n de signo o magnitud. Un par ESL malicioso o man-in-the-middle puede enviar una trama con un Content-Length negativo para corromper el heap de, o bloquear, cualquier proceso enlazado contra libesl, antes de que el cliente se haya autenticado con ese par. Este problema ha sido parcheado en la versi\u00f3n 1.11.1."}], "lastModified": "2026-07-23T08:10:00.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E8AED0D0-D5A1-4AA1-9CAE-13830B74CAC5", "versionEndExcluding": "1.11.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}