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Fencer Vulns
low 2.0

CVE-2026-23739 json

Asterisk xml.c uses unsafe XML_PARSE_NOENT leading to potential XXE Injection

published 2026-02-06 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-5646

cvss
2.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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.

Patch / fix

  • asterisk certified_asterisk 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, 23.2.2
  • asterisk open_source 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, 23.2.2
  • digium asterisk 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, 23.2.2
  • digium certified_asterisk 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, 23.2.2
  • sangoma certified_asterisk 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, 23.2.2
  • asterisk Debian 14 1:22.8.2+dfsg+~cs6.15.60671435-1

debian advisories DEBIAN-CVE-2026-23739

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23739 updated cvss 2.0

Asterisk: Asterisk: Local file disclosure via unsafe XML parsing

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

  • asterisk asterisk

Classification

Weakness
  • CWE-611 Improper Restriction of XML External Entity Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.