FreeSWITCH: Pre-authentication stack buffer overflow in mod_xml_rpc HTTP directory authentication

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116570
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 20:17:44 UTC
Updated2026-11-09 18:17:21 UTC
DescriptionFreeSWITCH 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.005530000 probability, percentile 0.464720000 (date 2026-11-09)

Problem Types: CWE-121 | CWE-131 | CWE-787 | CWE-121 CWE-121: Stack-based Buffer Overflow | CWE-131 CWE-131: Incorrect Calculation of Buffer Size | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Signalwire Freeswitch affected < 1.11.2 Not specified

References

ReferenceSourceLinkTags
github.com/signalwire/freeswitch/security/advisories/GHSA-294g-hq4w-c275 [email protected] github.com
github.com/signalwire/freeswitch/commit/0246a16beb416aaaa59edbaf131d80c9... [email protected] github.com
github.com/signalwire/freeswitch/releases/tag/v1.11.2 [email protected] github.com
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