What is CVE-2026-23739?

CVE-2026-23739 is a low-severity vulnerability in Asterisk, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 2.0/10. Published 2026-02-06.

How severe is CVE-2026-23739?

Low severity. CVSS v3 base score is 2.0 out of 10.

XXE in Asterisk

CVE-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 ast_xml_open() function in xml.c parses XML documents using libxml with unsafe parsing option…

Vulnerability class: XXE (XML External Entity)

EPSS: 0.002 (7.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.0 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N.

Affected products

Asterisk — versions < 23.2.2, < 22.8.2, < 21.12.1
Sangoma Asterisk
Sangoma Certified_asterisk — versions 20.7

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-23739?: CVE-2026-23739 is a low-severity vulnerability in Asterisk, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 2.0/10. Published 2026-02-06.
How severe is CVE-2026-23739?: Low severity. CVSS v3 base score is 2.0 out of 10.