XML Entity Expansion in freeswitch - CVE-2026-45771
Published: May 15, 2026
Vulnerability identifier: #VU131571
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-45771
CWE-ID: CWE-776
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: www.freeswitch.org
Affected software:
freeswitch
freeswitch
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper restriction of recursive entity references in DTDs in the core XML parser when parsing the PIDF body of a SIP PUBLISH request. A remote attacker can send a specially crafted SIP PUBLISH request containing nested XML entity declarations to cause a denial of service.
Only SIP profiles with manage-presence enabled are vulnerable, and the PIDF body is parsed before any registration, ACL, or digest check.
How to mitigate CVE-2026-45771
Install security update from vendor's website.