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CVE-2026-39863— Kamailio Core: TCP Data Processing Vulnerability

Quick assessment

Affected
kamailio kamailio
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.

Kamailio是Kamailio开源的一个 SIP 信令服务器的开源实现。 Kamailio 6.1.1之前版本、6.0.6之前版本和5.8.8之前版本存在缓冲区错误漏洞，该漏洞源于越界访问，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-39863

Vulnerability Information
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Vulnerability Title
Kamailio Core: TCP Data Processing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.1.1, 6.0.6, and 5.8.8, an out-of-bounds access in the core of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted data packet sent over TCP. The issue impacts Kamailio instances having TCP or TLS listeners. This vulnerability is fixed in 5.1.1, 6.0.6, and 5.8.8.
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
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Kamailio 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kamailio是Kamailio开源的一个 SIP 信令服务器的开源实现。 Kamailio 6.1.1之前版本、6.0.6之前版本和5.8.8之前版本存在缓冲区错误漏洞，该漏洞源于越界访问，可能导致拒绝服务。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
kamailio kamailio < 5.8.8 -

II. Public POCs for CVE-2026-39863

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III. Intelligence Information for CVE-2026-39863

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IV. Related Vulnerabilities

Same product: kamailio
Same vendor: kamailio
Same weakness: CWE-119

V. Comments for CVE-2026-39863

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