{"affected":[{"product":"freeswitch","source":"CNA: GitHub_M","vendor":"signalwire","versions":[{"status":"affected","version":"< 1.11.2"}]}],"cveId":"CVE-2026-116781","cwes":["CWE-193","CWE-787"],"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, ws_read_frame() unmasked a WebSocket payload by iterating wsh->datalen, which included frame headers, while indexing from the payload pointer. A masked frame filling the 64 KiB receive buffer could therefore XOR up to 14 bytes beyond the buffer, and the exact-capacity case also wrote a terminating NUL one byte out of bounds. The flaw is reachable before authentication when mod_xml_rpc and its opt-in WebSocket endpoint are enabled, while both features are disabled in the stock configuration. The writes remain within the same connection handle's adjacent outbound buffer, so neither a process crash nor cross-session disclosure has been demonstrated. This issue is fixed in version 1.11.2.","epss":{"date":"2026-11-09","percentile":0.18483,"score":0.00265},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: security-advisories@github.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1794266232933,"publishedAt":1793906889040,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-4cg6-rvh2-cw74"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/signalwire/freeswitch/commit/fb9f37b9c7869630ee52a3ae87399fbbf99ad74d"},{"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/fb9f37b9c7869630ee52a3ae87399fbbf99ad74d"},{"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-4cg6-rvh2-cw74"}],"remediation":[],"revision":"3c672f105406f9c4d3791a9ecae3808501efa81d4883e8df9f3227b47b520523","sources":[{"modifiedAt":1794264152472,"name":"CNA: GitHub_M","retrievedAt":1794265723712,"url":"https://www.cve.org/CVERecord?id=CVE-2026-116781"},{"modifiedAt":1794266232933,"name":"NVD","retrievedAt":1794269906528,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116781"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794265728522,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-116781"}],"ssvc":{"assessedAt":1794264140802,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"FreeSWITCH: Pre-authentication out-of-bounds writes in mod_xml_rpc WebSocket frame parsing","updatedAt":1794269906528}