TI-2026-01655 Aliases CVE-2026-1998 GHSA-p2vv-8mpq-57x2

micropython runtime.c mp_import_all memory corruption

MEDIUM 55CWE-119Published 2026-02-06 · Updated 2026-02-23

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00225 13th percentileScored 2026-11-07

Public exploit Yes 3 exploit referencesTagged by NVD and the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	micropython	1.0; 1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7; 1.8; 1.9; 1.10; 1.11; 1.12; 1.13; 1.14; 1.15; 1.16; 1.17; 1.18; 1.19; 1.20; 1.21; 1.22; 1.23; 1.24; 1.25; 1.26; 1.27.0	—	No fix listed	CNA

micropython Vendor— Affected 1.0; 1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7; 1.8; 1.9; 1.10; 1.11; 1.12; 1.13; 1.14; 1.15; 1.16; 1.17; 1.18; 1.19; 1.20; 1.21; 1.22; 1.23; 1.24; 1.25; 1.26; 1.27.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:micropython:micropython::::::::	up to 1.27.0	Vulnerable	Micropython

cpe:2.3:a:micropython:micropython:*:*:*:*:*:*:*:* Versions up to 1.27.0 Vulnerable ·Micropython

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-1998
2026-10-03 Alias added: GHSA-p2vv-8mpq-57x2

References

Exploit 3

Patch 1

https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6

Other 1

https://github.com/micropython/micropython/

TI-2024-08308 MicroPython objint.c mpz_as_bytes heap-based overflow CVSS 4.0MEDIUM 6.9
TI-2024-08306 MicroPython VFS Unmount vfs.c mp_vfs_umount heap-based overflow CVSS 4.0MEDIUM 6.9
TI-2024-08307 MicroPython objarray.c use after free CVSS 4.0MEDIUM 6.3
TI-2023-06546 MicroPython objslice.c slice_indices heap-based overflow CVSS 3.1CRITICAL 9.8
TI-2023-06540 MicroPython modselect.c poll_set_add_fd use after free CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences