{"id":"CVE-2026-116783","aliases":["EUVD-2026-117759","GHSA-mjp3-3cq2-hxj4"],"status":"published","title":"FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data","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, 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.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00618,"percentile":0.50119,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-129","CWE-787"],"published":"2026-11-05T19:41:44Z","modified":"2026-11-10T18:57:10Z","products":[{"vendor":"freeswitch","product":"freeswitch"},{"vendor":"signalwire","product":"freeswitch"}],"references":[{"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-mjp3-3cq2-hxj4","tags":["x_refsource_CONFIRM","Vendor Advisory","Mitigation","advisory"]},{"url":"https://github.com/signalwire/freeswitch/commit/b999d2a594f025ac0dd4d7b137635308ef298272","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.2","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116783.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116783","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-116783","title":"FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data","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, 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.","status":"published","published":"2026-11-05T19:41:44.761Z","modified":"2026-11-09T22:44:19.916Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-129","CWE-787"],"updated_at":"2026-11-09T23:35:21.200784Z"}],"euvd":[{"id":"EUVD-2026-117759","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, 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.","status":"published","published":"2026-11-05T19:41:44Z","modified":"2026-11-09T22:44:19Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-10T00:18:43.414497Z"}],"nvd":[{"id":"CVE-2026-116783","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, 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.","status":"published","published":"2026-11-05T20:17:45.4Z","modified":"2026-11-10T18:57:10.017Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-129","CWE-787"],"updated_at":"2026-11-10T20:21:08.549394Z"}],"osv":[{"id":"CVE-2026-116783","title":"FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data","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, 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.","status":"published","published":"2026-11-05T19:41:44.761Z","modified":"2026-11-12T07:06:27.044502851Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"cwes":["CWE-129","CWE-787"],"updated_at":"2026-11-07T03:08:01.156605Z"}]}}