# CVE-2026-116574: FreeSWITCH XML escape encoder buffer overrun in switch_xml_ampencode()

Source: https://junglewise.ai/threats/cve-2026-116574-freeswitch-is-a-software-defined-telecom-stack-enabling-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-05. Updated: 2026-11-05  
License: CC BY 4.0 with a link back

CVE-2026-116574 · Severity: medium · CVSS 5.9 · Published 2026-11-05

FreeSWITCH is a software-based telecom system that handles voice and video calls for organizations replacing traditional hardware switches. A buffer overrun in XML text encoding can cause the application to crash or corrupt memory when processing caller data in call records and event messages, potentially leading to service denial or system instability.

Technologies: [SignalWire FreeSWITCH](https://junglewise.ai/threats/technologies/freeswitch). Vendors: [SignalWire](https://junglewise.ai/threats/vendors/signalwire).

## Quick answers

**Is CVE-2026-116574 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116574 being exploited in the wild.

**How severe is CVE-2026-116574?** Medium severity, with a CVSS score of 5.9, published 5 November 2026.

**Which products and versions are affected?** SignalWire FreeSWITCH before 1.11.2.

**Is there a fix for CVE-2026-116574?** Yes: fixed in 1.11.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116574 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-116574?** Check whether you run SignalWire FreeSWITCH at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.11.2

## Technical details

The switch_xml_ampencode() function reserved only 10 bytes for the numeric character reference produced from a four-byte UTF-8 sequence, omitting space for the terminating NUL written by sprintf(). When remote-supplied text is serialized at the buffer-growth boundary, this NUL byte writes one byte beyond the heap allocation. The vulnerability is reachable through mod_xml_cdr, conference records, and XML API outputs that serialize caller-controlled values; remote code execution has not been demonstrated, but the overwrite can abort the process or truncate adjacent heap objects.

## Affected products

- SignalWire FreeSWITCH before 1.11.2

## Timeline

- 2026-11-05: disclosed

## References

- [https://github.com/signalwire/freeswitch/commit/28fcfd26246c112fa4b9e698433d09e4836ca1b5](https://github.com/signalwire/freeswitch/commit/28fcfd26246c112fa4b9e698433d09e4836ca1b5)
- [https://github.com/signalwire/freeswitch/releases/tag/v1.11.2](https://github.com/signalwire/freeswitch/releases/tag/v1.11.2)

## Related threats

- [FreeSWITCH ICE integrity validation bypass](https://junglewise.ai/threats/cve-2026-116790-freeswitch-is-a-software-defined-telecom-stack-enabling-the)
- [FreeSWITCH DTLS fingerprint validation bypass in server role](https://junglewise.ai/threats/cve-2026-116789-freeswitch-is-a-software-defined-telecom-stack-enabling-the)
- [FreeSWITCH integer underflow in XML decode](https://junglewise.ai/threats/cve-2026-116788-freeswitch-is-an-open-source-software-telecommunications)
- [FreeSWITCH mod_event_socket denial of service via Content-Length](https://junglewise.ai/threats/cve-2026-116787-freeswitch-is-a-software-defined-telecom-stack-enabling-the)
- [FreeSWITCH command injection via SIP REFER URI parameters](https://junglewise.ai/threats/cve-2026-116786-freeswitch-is-a-software-defined-telecom-stack-enabling-the)