CVE-2026-49840
signalwire freeswitch 취약점
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.
- 대응 우선순위
- 점검
- CVSS
- 9.1
- EPSS
- 0.31% 백분위 23.4% · 2026.07.31 기준
- CISA KEV
- 미등록
- 조치 기한
- -
- 공개일
- 2026.06.10