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CVE-2026-23739— Asterisk xml.c uses unsafe XML_PARSE_NOENT leading to potential XXE Injection

Quick assessment

Affected
asterisk asterisk
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.

Asterisk是Asterisk开源的一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 20.7-cert9之前版本、20.18.2之前版本、21.12.1之前版本、22.8.2之前版本和23.2.2之前版本存在代码问题漏洞，该漏洞源于XML解析函数使用不安全的解析选项，可能导致XML外部实体攻击或基于XInclude的本地文件泄露。

CVSS 2.0 · Low EPSS 0.19% · P8
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I. Basic Information for CVE-2026-23739

Vulnerability Information
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Vulnerability Title
Asterisk xml.c uses unsafe XML_PARSE_NOENT leading to potential XXE Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the ast_xml_open() function in xml.c parses XML documents using libxml with unsafe parsing options that enable entity expansion and XInclude processing. Specifically, it invokes xmlReadFile() with the XML_PARSE_NOENT flag and later processes XIncludes via xmlXIncludeProcess().If any untrusted or user-supplied XML file is passed to this function, it can allow an attacker to trigger XML External Entity (XXE) or XInclude-based local file disclosure, potentially exposing sensitive files from the host system. This can also be triggered in other cases in which the user is able to supply input in xml format that triggers the asterisk process to parse it. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
Asterisk 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Asterisk是Asterisk开源的一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 20.7-cert9之前版本、20.18.2之前版本、21.12.1之前版本、22.8.2之前版本和23.2.2之前版本存在代码问题漏洞，该漏洞源于XML解析函数使用不安全的解析选项，可能导致XML外部实体攻击或基于XInclude的本地文件泄露。
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
asterisk asterisk < 23.2.2 -

II. Public POCs for CVE-2026-23739

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III. Intelligence Information for CVE-2026-23739

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Same Patch Batch · asterisk · 2026-02-06 · 4 CVEs total

CVE-2026-23738 3.5 LOW The Asterisk embedded web server 's /httpstatus page echos user supplied values(cookie and
CVE-2026-23740 Asterisk vulnerable to potential privilege escalation
CVE-2026-23741 ast_coredumper running as root sources ast_debug_tools.conf from /etc/asterisk; potentiall

IV. Related Vulnerabilities

Same product: asterisk
Same vendor: asterisk
Same weakness: CWE-611

V. Comments for CVE-2026-23739

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