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CVE-2026-116569— FreeSWITCH: Pre-authentication out-of-bounds write in MSRP message body parsing

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 是一个软件定义的电信栈，旨在推动从专有电信交换机向可在任何通用硬件上运行的软件实现的数字化转型。在 1.11.2 版本之前，msrp_parse_buffer() 函数在未先验证数据段长度是否足够的情况下，便从一个由对等端控制的、MSRP 字节范围以 "*" 结尾的短数据段中减去了定界符帧开销。由于该运算结果是无符号整数，导致其发生回绕（wrap-around），接近 SIZE_MAX，随后该值被同时用作 switch_msrp_msg_set_payload() 中的内存分配大小和 memc

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
signalwire freeswitch < 1.11.2 affected
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I. Basic Information for CVE-2026-116569

Vulnerability Information
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Vulnerability Title
FreeSWITCH: Pre-authentication out-of-bounds write in MSRP message body parsing
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, msrp_parse_buffer() subtracted delimiter framing from a peer-controlled short segment whose MSRP byte range ended in * without first proving the segment was long enough. The unsigned result wrapped near SIZE_MAX and reached switch_msrp_msg_set_payload() as both an allocation size and memcpy length, while related pointer arithmetic could read before the receive buffer. The listener is disabled by default in msrp.conf.xml, but any deployment enabling an MSRP TCP or TLS port parses this framing before authentication. An unauthenticated network peer can corrupt memory and crash FreeSWITCH, dropping all active calls, although remote code execution has not been demonstrated. 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:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
signalwire freeswitch < 1.11.2 -

II. Public POCs for CVE-2026-116569

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III. Intelligence Information for CVE-2026-116569

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Other References for CVE-2026-116569 (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-2026-116785 9.1 CRITICAL FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame len
CVE-2026-116790 9.1 CRITICAL FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-IN
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-2026-116782 7.5 HIGH FreeSWITCH: Pre-authentication invalid pointer dereference in mod_rtmp connect command han
CVE-2026-116568 7.5 HIGH FreeSWITCH: Out-of-bounds read in mod_rtmp H.264 video message parsing
CVE-2026-116567 7.5 HIGH FreeSWITCH: Pre-authentication stack buffer overflow in mod_rtmp control-message handling
CVE-2026-116570 7.5 HIGH FreeSWITCH: Pre-authentication stack buffer overflow in mod_xml_rpc HTTP directory authent
CVE-2026-116787 7.5 HIGH FreeSWITCH: Pre-authentication process termination in the Event Socket via an unbounded Co
CVE-2026-115928 7.5 HIGH FreeSWITCH: Stack buffer overflow parsing the SDP a=crypto key material on inbound calls
CVE-2026-116784 7.5 HIGH FreeSWITCH: Out-of-bounds read in RTCP NACK feedback parsing
CVE-2026-116789 7.4 HIGH FreeSWITCH: DTLS-SRTP peer certificate is not bound to the SDP fingerprint when FreeSWITCH
CVE-2026-116572 6.5 MEDIUM FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP Contact display-name
CVE-2026-116573 6.5 MEDIUM FreeSWITCH mod_sofia: stack buffer overflow from an over-long SIP To-header user
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
CVE-2026-116780 2.7 LOW FreeSWITCH: Heap out-of-bounds read in FreeSWITCH core variable expansion via `${variable:

IV. Related Vulnerabilities

Same product: freeswitch
Same vendor: signalwire
Same weakness: CWE-191