External risk intelligence

Heap Buffer Overflow in MMS Initiate Request Allows Remote Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-49035

The vulnerability involves an MMS Initiate request, a protocol typically used in telecommunications or specific messaging infrastructure. While network-reachable, MMS services are generally part of specialized carrier or enterprise messaging backends rather than standard public-facing web applications or edge gateways, making widespread public internet exposure less common.

Remote Code Execution

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability involving a memory overflow within certain systems, potentially allowing remote attackers to execute code or cause service disruptions. The main concern is confirming relevance and exposure.

Memory overflow risk in messaging systems.
Critical remote code execution potential.
Confirm if affected systems are in use.

Attack Path

How an attacker could exploit the issue

An attacker could potentially reach the vulnerable component by sending a specially crafted MMS Initiate request over the network. This could lead to a heap-based buffer overflow, potentially resulting in remote code execution if Address Space Layout Randomization (ASLR) is disabled, or memory corruption and denial of service if ASLR is enabled.

Entry condition: Network access.
Trigger point: Crafted MMS Initiate request.
Resulting risk: Remote code execution or denial of service.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could impact systems processing specially crafted MMS Initiate requests, potentially leading to memory corruption, denial of service, or even remote code execution under specific conditions, such as when address space layout randomization (ASLR) is disabled.

System memory or integrity.
Crafted MMS Initiate requests are sent.
Remote code execution or denial of service.

Operational Fix

Recommended remediation, mitigation, and detection steps

The impact of this heap-based buffer overflow vulnerability in MMS Initiate requests necessitates collaboration between application owners and potentially infrastructure or platform teams. The first critical step is to identify all instances of the affected technology, ascertain their exposure and business criticality, and confirm the accountable owner for remediation planning.

Application or Platform Owners
Verify MMS request reachability and impact.
Plan remediation or risk reduction.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the software affected by CVE-2026-49035?

This software handles Multimedia Messaging Service (MMS) communications. It is typically deployed within telecommunications networks or specialized messaging infrastructure to process, route, and deliver rich media messages between mobile devices and backend services.

How does this CVE-2026-49035 vulnerability work?

This is a heap-based buffer overflow, classified as CWE-122. It occurs when the software fails to properly manage memory while processing a malformed MMS Initiate request, causing data to overwrite adjacent memory spaces. This corruption can disrupt service or, in specific environments, allow an unauthorized actor to execute arbitrary commands.

What triggers the vulnerability?

An attacker triggers the flaw by sending a specially crafted MMS Initiate request over the network to the vulnerable component. This vulnerability is not triggered by standard, well-formed messaging traffic; it specifically requires the transmission of malformed data designed to exceed the allocated heap buffer boundaries.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal notes that while this vulnerability is network-reachable, it typically affects specialized carrier or messaging backends rather than public-facing web servers. Risk depends on whether your infrastructure processes raw MMS Initiate requests, which is less common in standard internet-facing applications.

What are the first steps to address this issue?

Begin by auditing your infrastructure to identify all systems that process MMS Initiate requests. Once located, confirm the current deployment configuration, assess the business criticality of those assets, and identify the team responsible for managing these messaging components to prioritize necessary updates.

References

www.cisa.gov/news-events/ics-advisories/icsa-26-204-06

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.