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CVE-2026-49475— FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing

Quick assessment

Affected
signalwire freeswitch
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeSWITCH是美国Anthony Minessale个人开发者的研发的一套免费、开源的通信软件。该软件可用于创建音、视频以及短消息类产品和应用。 FreeSWITCH 1.11.0之前版本存在输入验证错误漏洞，该漏洞源于STUN数据包中声明的属性长度小于解析器转换的结构，导致解析器读取和写入超出属性末尾，产生越界内存访问。

CVSS 7.5 · High EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
signalwire freeswitch < 1.11.0 affected
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I. Basic Information for CVE-2026-49475

Vulnerability Information
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Vulnerability Title
FreeSWITCH: Out-of-bounds memory access in core STUN attribute 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 version 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser casts to causes the parser to read and write past the end of the attribute, producing an out-of-bounds memory access on the per-leg media buffer. This issue has been patched in version 1.11.0.
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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeSWITCH 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeSWITCH是美国Anthony Minessale个人开发者的研发的一套免费、开源的通信软件。该软件可用于创建音、视频以及短消息类产品和应用。 FreeSWITCH 1.11.0之前版本存在输入验证错误漏洞，该漏洞源于STUN数据包中声明的属性长度小于解析器转换的结构，导致解析器读取和写入超出属性末尾，产生越界内存访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
signalwire freeswitch < 1.11.0 -

II. Public POCs for CVE-2026-49475

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9024 chars
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III. Intelligence Information for CVE-2026-49475

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Vendor Advisories for CVE-2026-49475 (1)

Vendor Pages for CVE-2026-49475 (1)

Same Patch Batch · signalwire · 2026-06-09 · 9 CVEs total

CVE-2026-49841 9.8 CRITICAL FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read
CVE-2026-49840 9.1 CRITICAL FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing
CVE-2026-45771 7.5 HIGH Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion
CVE-2026-49842 7.5 HIGH FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames
CVE-2026-49847 7.5 HIGH FreeSWITCH: Stack overflow in bundled cJSON parser via deeply nested JSON
CVE-2026-49843 5.3 MEDIUM FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto
CVE-2026-49472 5.3 MEDIUM FreeSWITCH includes a vulnerable function, PREFIX(prologTok)() from libexpat
CVE-2026-49848 4.3 MEDIUM FreeSWITCH: Pre-authentication `userVariables` injection in `mod_verto`

IV. Related Vulnerabilities

Same product: freeswitch
Same vendor: signalwire
Same weakness: CWE-20

V. Comments for CVE-2026-49475

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