# CVE-2026-115678: Arm Keil MDK-Middleware out-of-bounds read in SNMP processing

Source: https://junglewise.ai/threats/cve-2026-115678-arm-keil-mdk-middleware-8-0-0-8-3-0-may-allow-pre-authentication  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-115678 · Severity: info · Published 2026-10-26

Arm Keil MDK-Middleware is a software development kit used to create embedded applications for microcontrollers. A flaw in the SNMP protocol implementation allows an attacker to send malformed SNMP packets that trigger an out-of-bounds memory read, potentially exposing sensitive data or causing a crash without requiring authentication.

Technologies: [Arm Keil MDK-Middleware](https://junglewise.ai/threats/technologies/keil-mdk-middleware). Vendors: [Arm](https://junglewise.ai/threats/vendors/arm).

## Quick answers

**Is CVE-2026-115678 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115678 being exploited in the wild.

**How severe is CVE-2026-115678?** Informational severity, published 26 October 2026.

**Which products and versions are affected?** Arm Keil MDK-Middleware 8.0.0 to 8.3.0.

**Is there a fix for CVE-2026-115678?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-115678 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115678?** Check whether you run Arm Keil MDK-Middleware 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.

## Technical details

An out-of-bounds read vulnerability exists in the SNMP processing component of MDK-Middleware versions 8.0.0 through 8.3.0. The vulnerability is pre-authentication and requires only network access to send a crafted SNMP packet; no user interaction or prior authentication is needed. An attacker can read adjacent memory contents or crash the device, though the specific data exposed depends on the application's memory layout.

## Affected products

- Arm Keil MDK-Middleware 8.0.0 to 8.3.0

## Timeline

- 2026-10-26: disclosed

## References

- [https://support.arm.com/documentation/112560](https://support.arm.com/documentation/112560)

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- [Arm Keil MDK-Middleware FTP Server out-of-bounds buffer access](https://junglewise.ai/threats/cve-2026-115679-arm-keil-mdk-middleware-8-3-0-may-allow-out-of-bounds-reads-and)