Bug 2567771 (CVE-2026-116570)

Summary: CVE-2026-116570 freeswitch: freeswitch: Denial of Service via stack-based buffer overflow in mod_xml_rpc
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeSWITCH. An unauthenticated remote attacker can trigger a stack-based buffer overflow by sending an HTTP request to an exposed mod_xml_rpc interface referencing a directory user configured with long credentials. This issue causes memory corruption that can crash the service, resulting in a Denial of Service (DoS) and terminating all active calls.
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Description OSIDB Bzimport 2026-11-05 22:24:44 UTC 
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, http_directory_auth() rebuilt an expected user@domain:password credential and base64-encoded it into an 80-byte buffer using an encoder without an output-length argument. A configured credential longer than 57 characters overflowed the stack before the supplied HTTP Basic password was compared. An unauthenticated client only needed to name an existing directory user on an exposed mod_xml_rpc HTTP listener; the module is built but not loaded by the stock configuration. The overflow can corrupt the stack and crash FreeSWITCH, ending every active call, although the overrun bytes come from the configured credential and remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.