Vulnerability · Published Feb 6, 2026 · Assigned by GitHub_M
CVE-2026-23739Asterisk xml.c uses unsafe XML_PARSE_NOENT leading to potential XXE Injection
Low 2.0
In plain English
A low-severity XML external entity in asterisk from asterisk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | asterisk | 1:22.8.2+dfsg+~cs6.15.60671435-1 | DEBIAN-CVE-2026-23739 |
| Ubuntu:22.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-23739 |
| Ubuntu:24.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-23739 |
| Ubuntu:25.10 | asterisk | no fix listed | UBUNTU-CVE-2026-23739 |
| Ubuntu:26.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-23739 |
| Ubuntu:26.10 | asterisk | no fix listed | UBUNTU-CVE-2026-23739 |
Affected products (as reported)
Weakness: CWE-611 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
References
- https://github.com/asterisk/asterisk/security/advisories/GHSA-85x7-54wr-vh42 x_refsource_CONFIRM