{"affected":[{"product":"freeswitch","source":"CNA: GitHub_M","vendor":"signalwire","versions":[{"status":"affected","version":"< 1.11.2"}]},{"ecosystem":"c","packageName":"FreeSWITCH","product":"FreeSWITCH","source":"GitHub GHSA-hj6x-9653-p796","vendor":"","versions":[{"status":"affected","version":"<= 1.11.1","versionType":"GitHub advisory range"}]}],"cveId":"CVE-2026-116567","cwes":["CWE-121"],"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 1.11.2, rtmp_handle_control() rendered an RTMP user-control message into a 200-byte stack buffer using an unbounded sprintf loop controlled by the wire message length. A body of roughly 70 bytes or more overflowed the stack before any RTMP login, because the handshake authenticates neither side. The flaw affects deployments that build and load mod_rtmp, which is disabled in the stock build and configuration but commonly exposes a listener on TCP port 1935 when enabled. One unauthenticated message can crash FreeSWITCH and end every active call; the constrained ASCII hex output has not yielded control-flow hijacking. This issue is fixed in version 1.11.2.","epss":{"date":"2026-11-09","percentile":0.37674,"score":0.00432},"exploits":[],"kev":null,"metrics":[{"score":7.5,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":7.5,"severity":"high","source":"NVD: security-advisories@github.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794248467348,"publishedAt":1793906605422,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-hj6x-9653-p796"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/signalwire/freeswitch/commit/fc0db829b87d1a5a3043e355b4294c41851b13c6"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/signalwire/freeswitch/commit/fc0db829b87d1a5a3043e355b4294c41851b13c6"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-hj6x-9653-p796"},{"source":"GitHub Security Advisories","tags":["advisory"],"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-hj6x-9653-p796"}],"remediation":[{"kind":"fix","source":"GitHub GHSA-hj6x-9653-p796","text":"FreeSWITCH (c): GitHub reports patched versions >= 1.11.2. Check the advisory for the affected release branch.","url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-hj6x-9653-p796"}],"revision":"58c0e45ad537f43bfcb0861359fa08b3174cf5cd3fcef92c476ba70d9fe3c658","sources":[{"modifiedAt":1794248467348,"name":"CNA: GitHub_M","retrievedAt":1794251312806,"url":"https://www.cve.org/CVERecord?id=CVE-2026-116567"},{"modifiedAt":1793918293080,"name":"NVD","retrievedAt":1793946373938,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116567"},{"modifiedAt":1793049081000,"name":"GitHub Security Advisories","retrievedAt":1794077109535,"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-hj6x-9653-p796"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794251327767,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-116567"}],"ssvc":{"assessedAt":1794248376625,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"FreeSWITCH: Pre-authentication stack buffer overflow in mod_rtmp control-message handling","updatedAt":1794251327767}