{"id":"CVE-2026-116783","title":"FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data","summary":"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, udptl_rx_packet() used a peer-control…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-129","CWE-787"],"vendor":"signalwire","product":"freeswitch","affected":["freeswitch < 1.11.2"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:41:44.761Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116783","references":[{"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-mjp3-3cq2-hxj4","label":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-mjp3-3cq2-hxj4"},{"url":"https://github.com/signalwire/freeswitch/commit/b999d2a594f025ac0dd4d7b137635308ef298272","label":"https://github.com/signalwire/freeswitch/commit/b999d2a594f025ac0dd4d7b137635308ef298272"},{"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2","label":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.557Z","slug":"CVE-2026-116783","body":"## Overview\n\nFreeSWITCH 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, udptl_rx_packet() used a peer-controlled FEC entry count directly to fill five-entry FEC arrays in a mod_spandsp T.38 session. A larger count wrote sender-controlled error-recovery data beyond those arrays and persisted the oversized count for a later reconstruction pass. Any peer able to deliver UDPTL to an established T.38 fax session can reach the parser, including deployments using fax applications or a T.38 gateway. The memory corruption can crash FreeSWITCH and end every active call, although remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.\n\n## Affected\n\n- `freeswitch < 1.11.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}