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CVE-2026-116780— FreeSWITCH: Heap out-of-bounds read in FreeSWITCH core variable expansion via `${variable:offset}` slicing

Quick assessment

Affected
signalwire freeswitch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeSWITCH 是一个软件定义电信栈，旨在推动电信交换机从专有硬件向可运行于任何通用硬件的软件实现进行数字化转型。在 1.11.2 版本之前，当 中的正偏移量超过变量值的长度时， 函数会超出其堆拷贝的边界。随后的长度计算与复制操作会将相邻的堆内存附加到展开结果中，从而可能暴露信道变量、凭据、内存分配器数据以及指针字节。该漏洞可通过配置模板（对远程输入进行切片）触发，也可通过已认证的 Event Socket 或 命令触发；而普通拨号计划切片所使用的独立信道变量展开器不受影响。攻击者无法自主选择相邻内存，且信息

CVSS 2.7 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
signalwire freeswitch < 1.11.2 affected
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I. Basic Information for CVE-2026-116780

Vulnerability Information
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Vulnerability Title
FreeSWITCH: Heap out-of-bounds read in FreeSWITCH core variable expansion via `${variable:offset}` slicing
Source: CVE Program / CVE List V5
Vulnerability 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, switch_event_expand_headers_check() advanced beyond its heap copy when a positive offset in ${variable:offset} exceeded the variable value's length. The following length calculation and copy appended adjacent heap memory to the expansion result, potentially exposing channel variables, credentials, allocator data, and pointer bytes. The flaw is reachable through configuration templates that slice remote input and through authenticated Event Socket eval or Event Socket expand commands; the separate channel-variable expander used by ordinary dialplan slicing is unaffected. The requester cannot choose adjacent memory and disclosure stops at a zero byte, but repeated expansion can influence the layout. This issue is fixed in version 1.11.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
signalwire freeswitch < 1.11.2 -

II. Public POCs for CVE-2026-116780

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III. Intelligence Information for CVE-2026-116780

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Other References for CVE-2026-116780 (3)

Same Patch Batch · signalwire · 2026-11-05 · 21 CVEs total

CVE-2026-116779 9.8 CRITICAL FreeSWITCH: Inbound SIP MESSAGE can select the api chat proto and run FreeSWITCH API comma
CVE-2026-116790 9.1 CRITICAL FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-IN
CVE-2026-116785 9.1 CRITICAL FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame len
CVE-2026-116786 8.8 HIGH FreeSWITCH: Channel-variable injection via SIP REFER leads to command execution in mod_sof
CVE-2026-116783 8.2 HIGH FreeSWITCH mod_spandsp: out-of-bounds write parsing UDPTL error-recovery data
CVE-2026-116788 8.2 HIGH FreeSWITCH: Pre-authentication heap buffer overflow in core XML empty-entity decoding
CVE-2026-116787 7.5 HIGH FreeSWITCH: Pre-authentication process termination in the Event Socket via an unbounded Co
CVE-2026-116782 7.5 HIGH FreeSWITCH: Pre-authentication invalid pointer dereference in mod_rtmp connect command han
CVE-2026-116784 7.5 HIGH FreeSWITCH: Out-of-bounds read in RTCP NACK feedback parsing
CVE-2026-115928 7.5 HIGH FreeSWITCH: Stack buffer overflow parsing the SDP a=crypto key material on inbound calls
CVE-2026-116570 7.5 HIGH FreeSWITCH: Pre-authentication stack buffer overflow in mod_xml_rpc HTTP directory authent
CVE-2026-116567 7.5 HIGH FreeSWITCH: Pre-authentication stack buffer overflow in mod_rtmp control-message handling
CVE-2026-116568 7.5 HIGH FreeSWITCH: Out-of-bounds read in mod_rtmp H.264 video message parsing
CVE-2026-116569 7.5 HIGH FreeSWITCH: Pre-authentication out-of-bounds write in MSRP message body parsing
CVE-2026-116789 7.4 HIGH FreeSWITCH: DTLS-SRTP peer certificate is not bound to the SDP fingerprint when FreeSWITCH
CVE-2026-116573 6.5 MEDIUM FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP To-header user
CVE-2026-116572 6.5 MEDIUM FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP Contact display-name
CVE-2026-116571 5.9 MEDIUM FreeSWITCH: Stack buffer overflow in mod_rtmp AVC sequence-header construction
CVE-2026-116574 5.9 MEDIUM FreeSWITCH: Off-by-one heap write in core XML serialization of four-byte UTF-8 sequences
CVE-2026-116781 5.3 MEDIUM FreeSWITCH: Pre-authentication out-of-bounds writes in mod_xml_rpc WebSocket frame parsing

IV. Related Vulnerabilities

Same product: freeswitch
Same vendor: signalwire
Same weakness: CWE-125