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CVE-2026-50161— libre: Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow

Quick assessment

Affected
baresip re
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.

Baresip Foundation libre README是Baresip Foundation组织的一款实时通信协议栈。 Baresip Foundation libre README 4.8.1之前版本存在安全漏洞，该漏洞源于src/websock/websock.c文件中的websock_decode函数在处理使用64位扩展长度编码的掩码WebSocket帧时存在整数溢出，可能导致攻击者控制的堆损坏或拒绝服务。

CVSS 9.3 · Critical EPSS 0.38% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
baresip re < 4.8.1 affected
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I. Basic Information for CVE-2026-50161

Vulnerability Information
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Vulnerability Title
libre: Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr->len can wrap when hdr->len is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Baresip Foundation libre README 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Baresip Foundation libre README是Baresip Foundation组织的一款实时通信协议栈。 Baresip Foundation libre README 4.8.1之前版本存在安全漏洞，该漏洞源于src/websock/websock.c文件中的websock_decode函数在处理使用64位扩展长度编码的掩码WebSocket帧时存在整数溢出，可能导致攻击者控制的堆损坏或拒绝服务。
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
baresip re < 4.8.1 -

II. Public POCs for CVE-2026-50161

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10445 chars
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III. Intelligence Information for CVE-2026-50161

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Patches & Fixes for CVE-2026-50161 (3)

Vendor Advisories for CVE-2026-50161 (1)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2026-50161

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