CVE-2023-7158

MicroPython objslice.c slice_indices heap-based overflow

7.3 HighFix available

A vulnerability was found in MicroPython up to 1.21.0. It has been classified as critical. Affected is the function slice_indices of the file objslice.c. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.22.0 is able to address this issue. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-249180.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: Low

Exploit likelihood

1.23%Up 1.2 points since Dec 29, 2023

What each source reports

CVE List Score used 7.3

MicroPython objslice.c slice_indices heap-based overflow

Record: CVE-2023-7158
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 3.0: 7.3 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0: 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-122
Updated: 2026-11-02

EUVDEUVD-2023-59339 7.3

Record: EUVD-2023-59339
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x33q-m927-7mq6 7.3

A vulnerability was found in MicroPython up to 1.21.0. It has been classified as critical....

Record: GHSA-x33q-m927-7mq6
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-122, CWE-787
Updated: 2026-11-02

NVD 7.3

Record: CVE-2023-7158
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-122, CWE-787
Updated: 2026-11-02

OSV 7.3

MicroPython objslice.c slice_indices heap-based overflow

Record: CVE-2023-7158
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness: CWE-122
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-7158 7.3

Record: UBUNTU-CVE-2023-7158
CVSS 3.1: 7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2024:13566-1 No score

micropython-1.22.0-1.1 on GA media

These are all security issues fixed in the micropython-1.22.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:13566-1
Updated: 2026-11-02

Affected products

micropython

Affected packages

Affected packages
Package	Affected	Fixed
`giac` Ubuntu:18.04:LTS	All versions, plus listed versions 1.2.3.57+dfsg1-2build11.2.3.57+dfsg1-2build21.2.3.57+dfsg1-2build3	None known
`giac` Ubuntu:20.04:LTS	All versions, plus listed versions 1.4.9.69+dfsg1-2build11.5.0.85+dfsg1-21.5.0.85+dfsg1-3	None known
`giac` Ubuntu:22.04:LTS	All versions, plus listed versions 1.6.0.41+dfsg1-11.7.0.39+dfsg2-1build11.7.0.39+dfsg2-1build2	None known
`giac` Ubuntu:24.04:LTS	All versions, plus listed versions 1.9.0.35+dfsg2-1.11.9.0.59+dfsg2-11.9.0.69+dfsg2-11.9.0.93+dfsg2-2	None known
`giac` Ubuntu:25.10	All versions, plus listed versions 1.9.0.93+dfsg2-3build1	None known
`giac` Ubuntu:26.10	All versions, plus listed versions 1.9.0.93+dfsg2-3build21.9.0.93+dfsg2-4	None known
`giac` Ubuntu:26.04:LTS	All versions, plus listed versions 1.9.0.93+dfsg2-3build11.9.0.93+dfsg2-3build2	None known
`micropython` openSUSE:Tumbleweed	before 1.22.0-1.1	1.22.0-1.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-7158 is a high vulnerability (CVSS 7.3) in Micropython, published December 29, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.23%, the 69th percentile. Fixed in micropython 1.22.0-1.1.

References

Show 9 moreShow less