# CVE-2026-116569: FreeSWITCH: Pre-authentication out-of-bounds write in MSRP message body parsing

Status: published. Published: 2026-11-05. Updated: 2026-11-09.

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, msrp_parse_buffer() subtracted delimiter framing from a peer-controlled short segment whose MSRP byte range ended in * without first proving the segment was long enough. The unsigned result wrapped near SIZE_MAX and reached switch_msrp_msg_set_payload() as both an allocation size and memcpy length, while related pointer arithmetic could read before the receive buffer. The listener is disabled by default in msrp.conf.xml, but any deployment enabling an MSRP TCP or TLS port parses this framing before authentication. An unauthenticated network peer can corrupt memory and crash FreeSWITCH, dropping all active calls, although remote code execution has not been demonstrated. This issue is fixed in version 1.11.2.

## Remediation

- fix: FreeSWITCH (c): GitHub reports patched versions >= 1.11.2. Check the advisory for the affected release branch. (source: GitHub GHSA-m8xv-crhj-3rf7) — https://github.com/signalwire/freeswitch/security/advisories/GHSA-m8xv-crhj-3rf7

## Affected products and versions

- signalwire / freeswitch: < 1.11.2 (affected). Source: CNA: GitHub_M
-  / FreeSWITCH (FreeSWITCH): <= 1.11.1 (affected, GitHub advisory range). Source: GitHub GHSA-m8xv-crhj-3rf7

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.63% as of 2026-11-09; percentile 50.53%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-191, CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/signalwire/freeswitch/security/advisories/GHSA-m8xv-crhj-3rf7 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/signalwire/freeswitch/commit/349f55ff546ab365f026eb254965af98232f81a9 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/signalwire/freeswitch/releases/tag/v1.11.2 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/signalwire/freeswitch/commit/349f55ff546ab365f026eb254965af98232f81a9 (security-advisories@github.com)

- https://github.com/signalwire/freeswitch/releases/tag/v1.11.2 (security-advisories@github.com)

- https://github.com/signalwire/freeswitch/security/advisories/GHSA-m8xv-crhj-3rf7 (security-advisories@github.com)

- https://github.com/signalwire/freeswitch/security/advisories/GHSA-m8xv-crhj-3rf7 (GitHub Security Advisories; advisory)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-116569; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116569; retrieved 2026-11-10; source updated 2026-11-09

- GitHub Security Advisories: https://github.com/signalwire/freeswitch/security/advisories/GHSA-m8xv-crhj-3rf7; retrieved 2026-11-07; source updated 2026-10-26

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116569; retrieved 2026-11-09; source updated Not reported

Revision: f27e2c587f39df3faf68c9d3a308b31438324fd3901f63ac088542d68c178607

Canonical: https://y2.dev/cve/CVE-2026-116569

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