Binutils Heap Overflow: Local Attackers Gain Code Execution via XCOFF Files
The National Vulnerability Database has disclosed CVE-2026-6846, a critical heap-buffer-overflow vulnerability within the binutils software. This flaw arises during the linking process when handling specially crafted XCOFF object files. A local attacker can exploit this by tricking a user into processing a malicious file, potentially leading to arbitrary code execution or denial of service.
This vulnerability, rated HIGH with a CVSS score of 7.8, presents a significant risk. While affected products are not explicitly specified, binutils is a foundational component in many development toolchains. Defenders must prioritize patching or mitigating systems that process untrusted XCOFF files, especially in environments where local user access can be leveraged for privilege escalation.
What This Means For You
- If your development pipeline or build systems utilize binutils to process XCOFF files, investigate patching immediately. Audit systems for any signs of malicious file processing that could indicate an attacker leveraging this vector for code execution.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-6846 - Binutils XCOFF Heap Overflow via Linking
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-6846 | Vulnerability | CVE-2026-6846 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 22, 2026 at 12:16 UTC |
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