CVE-2026-49472 FreeSWITCH includes a vulnerable function, PREFIX(prologTok)() from libexpat
FreeSWITCH contains an unpatched vulnerable function from libexpat, potentially allowing attackers to cause denial of service or execute code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49472?
CVE-2026-49472 is a medium-severity vulnerability in signalwire freeswitch, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, FreeSWITCH includes a vulnerable function, PREFIX(prologTok)(), in libs/xmlrpc-c/lib/expat/xmltok/xmltok_impl.c, which was cloned from an outdated and vulnerable version in libexpat/libexpat. The function did not receive the corresponding security patch. This issue has been patched in version 1.11.0.
Weakness: CWE-116
Which versions are affected by CVE-2026-49472?
It affects 1 product.
Products include Freeswitch Freeswitch.
How do I fix CVE-2026-49472?
No fix has been published for CVE-2026-49472 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49472 being exploited?
There is no known exploitation of CVE-2026-49472 in the wild and no public exploit code.
Other vulnerabilities in signalwire freeswitch
- CVE-2026-49841 FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read
- CVE-2019-19492 Hardcoded credentials in n/a
- CVE-2026-49840 FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing
- CVE-2021-41145 FreeSWITCH susceptible to Denial of Service via SIP flooding
- CVE-2026-45771 Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion
Sources
Also known as GHSA-4jm3-xpcm-mwwq.