CVE-2026-116783
Dashboard / Vulnerabilities / CVE-2026-116783
Summary: FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data
Details: 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.
References: https://github.com/signalwire/freeswitch/releases/tag/v1.11.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116783.json, https://github.com/signalwire/freeswitch/security/advisories/GHSA-mjp3-3cq2-hxj4, https://nvd.nist.gov/vuln/detail/CVE-2026-116783, https://github.com/signalwire/freeswitch/commit/b999d2a594f025ac0dd4d7b137635308ef298272
Affected packages
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