Buffer overflow in Signalwire Freeswitch
CVE-2026-116574
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 1.11.2, switch_xml_ampencode() reserved only ten bytes for the widest numeric character reference produced from a four-byte UTF-8 sequence, omitting space for the terminating NUL. When remote-supplied text was serialized at the exact buffer-growth boundary, the terminator wrote one byte beyond the heap allocation. Reachable surfaces include mod_xml_cdr, conference and formatted CDR XML, XML Event Socket output, and XML API output that serializes caller-controlled values. The fixed zero-byte write can abort the process or truncate an adjacent object, while remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Signalwire Freeswitch — versions < 1.11.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-116574?
- CVE-2026-116574 is a medium-severity vulnerability in Signalwire Freeswitch, classified under Off-by-one Error. CVSS score: 5.9/10. Published 2026-11-05.
- How severe is CVE-2026-116574?
- Medium severity. CVSS v3 base score is 5.9 out of 10.