CVE-2026-1998
📋 TL;DR
A memory corruption vulnerability in MicroPython's mp_import_all function allows local attackers to potentially execute arbitrary code or crash the interpreter. This affects MicroPython versions up to 1.27.0. The vulnerability requires local access to the system running MicroPython.
💻 Affected Systems
- MicroPython
📦 What is this software?
Micropython by Micropython
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise if MicroPython runs with elevated privileges.
Likely Case
Denial of service through interpreter crash or limited code execution within the MicroPython sandbox.
If Mitigated
Minimal impact if MicroPython runs in isolated containers with minimal privileges.
🎯 Exploit Status
Exploit requires local access and knowledge of how to trigger the vulnerable function. Published exploit code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in commit 570744d06c5ba9dba59b4c3f432ca4f0abd396b6 and later
Vendor Advisory: https://github.com/micropython/micropython/issues/18639
Restart Required: Yes
Instructions:
1. Update MicroPython to version after 1.27.0 or apply commit 570744d06c5ba9dba59b4c3f432ca4f0abd396b6. 2. Rebuild MicroPython from source. 3. Restart any applications using MicroPython.
🔧 Temporary Workarounds
Disable vulnerable imports
allRestrict or monitor usage of import operations that trigger mp_import_all
# Review and restrict Python code using wildcard imports
🧯 If You Can't Patch
- Run MicroPython in isolated containers with minimal privileges
- Implement strict access controls to prevent unauthorized local users from executing MicroPython code
🔍 How to Verify
Check if Vulnerable:
Check MicroPython version: import sys; print(sys.version)Check Version:
python3 -c "import sys; print('MicroPython' in sys.version and sys.version_info < (1, 27, 1))"Verify Fix Applied:
Verify version is newer than 1.27.0 or check if commit 570744d06c5ba9dba59b4c3f432ca4f0abd396b6 is applied in source📡 Detection & Monitoring
Log Indicators:
- MicroPython interpreter crashes
- Memory access violation errors in system logs
Network Indicators:
- None - local exploitation only
SIEM Query:
Process:micropython AND (EventID:1000 OR EventID:1001) OR Error:memory_corruption🔗 References
- https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6
- https://github.com/micropython/micropython/
- https://github.com/micropython/micropython/issues/18639
- https://github.com/micropython/micropython/issues/18639#issue-3780651410
- https://github.com/micropython/micropython/pull/18671
- https://vuldb.com/?ctiid.344546
- https://vuldb.com/?id.344546
- https://vuldb.com/?submit.743396
