CVE-2026-1998: A flaw has been found in micropython up to 1.27.0

Q: How do I fix CVE-2026-1998?

micropython: upgrade to newer than 1.27.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-1998 being exploited?

CVE-2026-1998 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-1998 affect?

CVE-2026-1998 affects micropython. Severity is low (CVSS 3.3). 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 pub

Q: How urgent is CVE-2026-1998?

Priority 20/100. Public exploit reference

Routine

LOW 3.3UPGRADE

CVE-2026-1998 is a low-severity flaw (CVSS 3.3) affecting micropython. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: micropython

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-06 07:16 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

micropython micropython UPGRADE

Affected: <= 1.27.0

Fixed in: newer than 1.27.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy micropython || rpm -q micropython || micropython --version

2. UPGRADE to newer than 1.27.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade micropython

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade micropython

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1998?

micropython: upgrade to newer than 1.27.0. Exact commands for each OS are on this page.

Is CVE-2026-1998 being exploited?

CVE-2026-1998 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1998 affect?

CVE-2026-1998 affects micropython. Severity is low (CVSS 3.3). 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 pub

How urgent is CVE-2026-1998?

Priority 20/100. Public exploit reference

Related CVEs

CVE-2024-8948 HIGH 7.3 DOWNGRADE A vulnerability was found in MicroPython 1.23.0
CVE-2024-8947 MEDIUM 5.6 DOWNGRADE A vulnerability was found in MicroPython 1.22.2
CVE-2024-8946 HIGH 7.3 DOWNGRADE A vulnerability was found in MicroPython 1.23.0

References

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