A flaw has been found in micropython up to 1.27.0. This vulnerability affects the function mp_import_all of the file py/runtime.c. This manipulation causes memory corruption. The attack needs to be launched locally. The exploit has been published and may be used. Patch name: 570744d06c5ba9dba59b4c3f432ca4f0abd396b6. It is suggested to install a patch to address this issue.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00015.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a micropython affected
Version Status Constraints
1.0 affected —
1.1 affected —
1.2 affected —
1.3 affected —
1.4 affected —
1.5 affected —
1.6 affected —
1.7 affected —
1.8 affected —
1.9 affected —
1.10 affected —
1.11 affected —
1.12 affected —
1.13 affected —
1.14 affected —
1.15 affected —
1.16 affected —
1.17 affected —
1.18 affected —
1.19 affected —
1.20 affected —
1.21 affected —
1.22 affected —
1.23 affected —
1.24 affected —
1.25 affected —
1.26 affected —
1.27.0 affected —

No data.

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6 cve-icon cve-icon
https://github.com/micropython/micropython/ cve-icon cve-icon
https://github.com/micropython/micropython/issues/18639 cve-icon cve-icon
https://github.com/micropython/micropython/issues/18639#issue-3780651410 cve-icon cve-icon
https://github.com/micropython/micropython/pull/18671 cve-icon cve-icon
https://vuldb.com/?ctiid.344546 cve-icon cve-icon
https://vuldb.com/?id.344546 cve-icon cve-icon
https://vuldb.com/?submit.743396 cve-icon cve-icon
History

Fri, 06 Feb 2026 06:30:00 +0000

Type Values Removed Values Added
Description A flaw has been found in micropython up to 1.27.0. This vulnerability affects the function mp_import_all of the file py/runtime.c. This manipulation causes memory corruption. The attack needs to be launched locally. The exploit has been published and may be used. Patch name: 570744d06c5ba9dba59b4c3f432ca4f0abd396b6. It is suggested to install a patch to address this issue.
Title micropython runtime.c mp_import_all memory corruption
Weaknesses CWE-119
References
Metrics cvssV2_0

{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-02-06T06:02:08.671Z

Reserved: 2026-02-05T17:09:46.272Z

Link: CVE-2026-1998

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-06T07:16:12.553

Modified: 2026-02-06T15:14:47.703

Link: CVE-2026-1998

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses