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CVE-2026-1998— micropython runtime.c mp_import_all memory corruption

Quick assessment

Affected
n/a micropython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MicroPython是MicroPython开源的一个小型的开源Python编程语言解释器。 MicroPython 1.27.0及之前版本存在缓冲区错误漏洞，该漏洞源于对文件py/runtime.c中函数mp_import_all的错误操作，可能导致内存损坏。

CVSS 3.3 · Low EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-1998

Vulnerability Information
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Vulnerability Title
micropython runtime.c mp_import_all memory corruption
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MicroPython 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MicroPython是MicroPython开源的一个小型的开源Python编程语言解释器。 MicroPython 1.27.0及之前版本存在缓冲区错误漏洞，该漏洞源于对文件py/runtime.c中函数mp_import_all的错误操作，可能导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- micropython 1.0 cpe:2.3:a:micropython:micropython:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-1998

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III. Intelligence Information for CVE-2026-1998

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Proof of Concept for CVE-2026-1998 (1)

Same Patch Batch · n/a · 2026-02-06 · 10 CVEs total

CVE-2026-2062 5.3 MEDIUM Open5GS PGW S5U Address sgwc_sxa_handle_session_modification_response null pointer derefer
CVE-2026-1979 5.3 MEDIUM mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
CVE-2026-1976 5.3 MEDIUM Free5GC SMF SessionDeletionResponse null pointer dereference
CVE-2026-1975 5.3 MEDIUM Free5GC pfcp_reports.go identityTriggerType null pointer dereference
CVE-2026-1974 5.3 MEDIUM Free5GC SMF datapath.go ResolveNodeIdToIp denial of service
CVE-2026-1973 5.3 MEDIUM Free5GC SMF establishPfcpSession null pointer dereference
CVE-2026-1991 3.3 LOW libuvc UVC Descriptor device.c uvc_scan_streaming null pointer dereference
CVE-2026-1990 3.3 LOW oatpp Type.hpp ObjectWrapper null pointer dereference
CVE-2025-70963 GoPhish 安全漏洞

IV. Related Vulnerabilities

Same product: micropython
Same vendor: n/a
Same weakness: CWE-119

V. Comments for CVE-2026-1998

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