CVE-2026-23739
published 2026-02-06CVE-2026-23739: 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…
PriorityP338medium6.5CVSS 3.1
AVNACLPRNUIRSUCHINAN
EPSS
0.18%
7.4th percentile
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
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| asterisk | asterisk | < 23.2.2 | 23.2.2 |
| asterisk | asterisk | < 22.8.2 | 22.8.2 |
| asterisk | asterisk | < 21.12.1 | 21.12.1 |
| asterisk | asterisk | < 20.18.2 | 20.18.2 |
| asterisk | asterisk | < 20.7-cert9 | 20.7-cert9 |
| asterisk | asterisk | >= 0 < 1:16.28.0~dfsg-0+deb11u9 | 1:16.28.0~dfsg-0+deb11u9 |
| debian | asterisk | < asterisk 1:16.28.0~dfsg-0+deb11u9 (bullseye) | asterisk 1:16.28.0~dfsg-0+deb11u9 (bullseye) |
| sangoma | asterisk | < 20.18.2 | 20.18.2 |
| sangoma | asterisk | >= 21.0.0 < 21.12.1 | 21.12.1 |
| sangoma | asterisk | >= 22.0.0 < 22.8.2 | 22.8.2 |
| sangoma | asterisk | >= 23.0.0 < 23.2.2 | 23.2.2 |
| sangoma | certified_asterisk | <= 18.9 | — |
| sangoma | certified_asterisk | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
osv6.5MEDIUM
vendor_debian2.0LOW
vendor_redhat2.0LOW
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Red Hat
Asterisk: Asterisk: Local file disclosure via unsafe XML parsing
vendor_redhat·2026-02-06·CVSS 2.0
CVE-2026-23739 [LOW] Asterisk: Asterisk: Local file disclosure via unsafe XML parsing
Asterisk: Asterisk: Local file disclosure via unsafe XML parsing
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 inpu
Debian
CVE-2026-23739: asterisk - Asterisk is an open source private branch exchange and telephony toolkit. Prior ...
vendor_debian·2026·CVSS 2.0
CVE-2026-23739 [LOW] CVE-2026-23739: asterisk - Asterisk is an open source private branch exchange and telephony toolkit. Prior ...
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. Th
OSV
CVE-2026-23739: Asterisk is an open source private branch exchange and telephony toolkit
osv·2026-02-06·CVSS 6.5
CVE-2026-23739 [MEDIUM] CVE-2026-23739: Asterisk is an open source private branch exchange and telephony toolkit
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. Th
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-23739 asterisk: Asterisk: Local file disclosure via unsafe XML parsing [fedora-42]
bugzilla·2026-02-09·CVSS 6.5
CVE-2026-23739 [MEDIUM] CVE-2026-23739 asterisk: Asterisk: Local file disclosure via unsafe XML parsing [fedora-42]
CVE-2026-23739 asterisk: Asterisk: Local file disclosure via unsafe XML parsing [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, chang
Wiz
CVE-2026-23739 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 2.0
CVE-2026-23739 [LOW] CVE-2026-23739 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23739 :
NixOS vulnerability analysis and mitigation
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 inpu
2026-02-06
Published