CVE-2026-23739
2.0 · LOWOverview
CVE-2026-23739 is a low-severity vulnerability affecting sangoma asterisk. It was published on February 6, 2026 and has a CVSS 3.1 base score of 2.0 (LOW).
This vulnerability has a CVSS 3.1 base score of 2.0, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from sangoma. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| sangoma | asterisk | >= 0, < 20.18.2 | Affected |
| sangoma | certified_asterisk | 0 | Affected |
Frequently Asked Questions
What is CVE-2026-23739?
CVE-2026-23739 is a low-severity vulnerability affecting sangoma asterisk. It was published on February 6, 2026 and has a CVSS 3.1 base score of 2.0 (LOW).
How severe is CVE-2026-23739?
This vulnerability has a CVSS 3.1 base score of 2.0, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-23739?
Check the references section for vendor advisories and patches from sangoma. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-23739?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-23739 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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