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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.

PUBLISHED Reserved 2026-02-05 | Published 2026-02-06 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 4.8CVSS: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
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Memory Corruption

Timeline

2026-02-05:Advisory disclosed
2026-02-05:VulDB entry created
2026-02-18:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.344546 (VDB-344546 | micropython runtime.c mp_import_all memory corruption) vdb-entry technical-description

vuldb.com/?ctiid.344546 (VDB-344546 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.743396 (Submit #743396 | micropython 0fd0843 Memory Corruption) third-party-advisory

github.com/micropython/micropython/issues/18639 issue-tracking

github.com/micropython/micropython/pull/18671 issue-tracking

github.com/micropython/micropython/issues/18639 exploit issue-tracking

github.com/...ommit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6 patch

github.com/micropython/micropython/ product

cve.org (CVE-2026-1998)

nvd.nist.gov (CVE-2026-1998)

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