# CVE-2026-116780: FreeSWITCH: Heap out-of-bounds read in FreeSWITCH core variable expansion via `${variable:offset}` slicing


- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 5 Nov 2026
- **Updated:** 9 Nov 2026
- **Also known as:** GHSA-2p6g-9c8q-232p

## What is CVE-2026-116780?

CVE-2026-116780 is a low-severity vulnerability in signalwire freeswitch, published on 5 Nov 2026. 

### 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 1.11.2, switch_event_expand_headers_check() advanced beyond its heap copy when a positive offset in ${variable:offset} exceeded the variable value's length. The following length calculation and copy appended adjacent heap memory to the expansion result, potentially exposing channel variables, credentials, allocator data, and pointer bytes. The flaw is reachable through configuration templates that slice remote input and through authenticated Event Socket eval or Event Socket expand commands; the separate channel-variable expander used by ordinary dialplan slicing is unaffected. The requester cannot choose adjacent memory and disclosure stops at a zero byte, but repeated expansion can influence the layout. This issue is fixed in version 1.11.2.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-116780?

It affects 1 product.


Products: Freeswitch.

## How do I fix CVE-2026-116780?

No fix has been published for CVE-2026-116780 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-116780 being exploited?

There is no known exploitation of CVE-2026-116780 in the wild and no public exploit code.

## Other vulnerabilities in signalwire freeswitch

- [CVE-2026-116779](https://insights.sbomify.com/CVE-2026-116779/): SignalWire FreeSwitch Code Injection (critical 9.8, exploited in the wild)
- [CVE-2026-49841](https://insights.sbomify.com/CVE-2026-49841/): FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read (critical 9.8)
- [CVE-2019-19492](https://insights.sbomify.com/CVE-2019-19492/): FreeSWITCH 1.6.10 through 1.10.1 has a default password in event_socket.conf.xml. (critical 9.8)
- [CVE-2026-116785](https://insights.sbomify.com/CVE-2026-116785/): FreeSWITCH: Pre-authentication heap out-of-bounds write in mod_xml_rpc WebSocket frame length handling (critical 9.1)
- [CVE-2026-116790](https://insights.sbomify.com/CVE-2026-116790/): FreeSWITCH: Inbound ICE connectivity checks are accepted without verifying STUN MESSAGE-INTEGRITY (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-116780 and fix it if it is affected.

What it is: CVE-2026-116780 is a low-severity vulnerability in signalwire freeswitch, published on 5 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-116780 in the wild and no public exploit code.

Affected product: signalwire freeswitch. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-116780/ (Markdown: https://insights.sbomify.com/CVE-2026-116780/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-116780
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116780
- OSV: https://osv.dev/vulnerability/CVE-2026-116780

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-116780/
Summaries are generated and may contain mistakes; the official description above is the record.