CVE-2026-1998

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Source
https://cve.org/CVERecord?id=CVE-2026-1998
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1998.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-1998
Downstream
Related
Published
2026-02-06T06:02:08.671Z
Modified
2026-07-15T15:53:42.791514Z
Severity
  • 1.9 (Low) CVSS_V4 - CVSS: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 CVSS Calculator
Summary
micropython runtime.c mp_import_all memory corruption
Details

A flaw has been found in micropython up to 1.27.0. This vulnerability affects the function mpimportall 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1998.json",
    "cna_assigner": "VulDB",
    "cwe_ids": [
        "CWE-119"
    ]
}
References

Affected packages

Git / github.com/dpgeorge/micropython

Affected ranges

Type
GIT
Repo
https://github.com/dpgeorge/micropython
Events
Introduced
6ec835dfef90a2f940a24b126cba8e3d8ede1ef2
Fixed
570744d06c5ba9dba59b4c3f432ca4f0abd396b6
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "1.0"
        },
        {
            "last_affected": "1.0"
        },
        {
            "introduced": "1.1"
        },
        {
            "last_affected": "1.1"
        },
        {
            "introduced": "1.2"
        },
        {
            "last_affected": "1.2"
        },
        {
            "introduced": "1.3"
        },
        {
            "last_affected": "1.3"
        },
        {
            "introduced": "1.4"
        },
        {
            "last_affected": "1.4"
        },
        {
            "introduced": "1.5"
        },
        {
            "last_affected": "1.5"
        },
        {
            "introduced": "1.6"
        },
        {
            "last_affected": "1.6"
        },
        {
            "introduced": "1.7"
        },
        {
            "last_affected": "1.7"
        },
        {
            "introduced": "1.8"
        },
        {
            "last_affected": "1.8"
        },
        {
            "introduced": "1.9"
        },
        {
            "last_affected": "1.9"
        },
        {
            "introduced": "1.10"
        },
        {
            "last_affected": "1.10"
        },
        {
            "introduced": "1.11"
        },
        {
            "last_affected": "1.11"
        },
        {
            "introduced": "1.12"
        },
        {
            "last_affected": "1.12"
        },
        {
            "introduced": "1.13"
        },
        {
            "last_affected": "1.13"
        },
        {
            "introduced": "1.14"
        },
        {
            "last_affected": "1.14"
        },
        {
            "introduced": "1.15"
        },
        {
            "last_affected": "1.15"
        },
        {
            "introduced": "1.16"
        },
        {
            "last_affected": "1.16"
        },
        {
            "introduced": "1.17"
        },
        {
            "last_affected": "1.17"
        },
        {
            "introduced": "1.18"
        },
        {
            "last_affected": "1.18"
        },
        {
            "introduced": "1.19"
        },
        {
            "last_affected": "1.19"
        },
        {
            "introduced": "1.20"
        },
        {
            "last_affected": "1.20"
        },
        {
            "introduced": "1.21"
        },
        {
            "last_affected": "1.21"
        },
        {
            "introduced": "1.22"
        },
        {
            "last_affected": "1.22"
        },
        {
            "introduced": "1.23"
        },
        {
            "last_affected": "1.23"
        },
        {
            "introduced": "1.24"
        },
        {
            "last_affected": "1.24"
        },
        {
            "introduced": "1.25"
        },
        {
            "last_affected": "1.25"
        },
        {
            "introduced": "1.26"
        },
        {
            "last_affected": "1.26"
        },
        {
            "introduced": "1.27.0"
        },
        {
            "last_affected": "1.27.0"
        }
    ]
}
Type
GIT
Repo
https://github.com/micropython/micropython
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
78ff170de9e32c79db6e64d3e33d2bd60002bdcd
Database specific 
{
    "cpe": "cpe:2.3:a:micropython:micropython:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.27.0"
        }
    ]
}

Affected versions

1.*
1.0
1.1
1.10
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.2
1.20
1.21
1.22
1.23
1.24
1.25
1.26
1.27.0
1.3
1.4
1.5
1.6
1.7
1.8
1.9
v1.*
v1.0
v1.0-rc1
v1.0.1
v1.1
v1.1.1
v1.10
v1.11
v1.12
v1.13
v1.14
v1.15
v1.16
v1.17
v1.18
v1.19
v1.19.1
v1.2
v1.20.0
v1.21.0
v1.22.0
v1.22.0-preview
v1.23.0
v1.23.0-preview
v1.24.0
v1.24.0-preview
v1.25.0
v1.25.0-preview
v1.26.0
v1.26.0-preview
v1.27.0
v1.27.0-preview
v1.28.0-preview
v1.3
v1.3.1
v1.3.10
v1.3.2
v1.3.3
v1.3.4
v1.3.5
v1.3.6
v1.3.7
v1.3.8
v1.3.9
v1.4
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.4.6
v1.5
v1.5.1
v1.5.2
v1.6
v1.7
v1.8
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5
v1.8.6
v1.8.7
v1.9
v1.9.1
v1.9.2
v1.9.3
v1.9.4

Database specific

vanir_signatures 
[
    {
        "signature_version": "v1",
        "target": {
            "file": "py/runtime.c"
        },
        "id": "CVE-2026-1998-147965e6",
        "signature_type": "Line",
        "source": "https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6",
        "digest": {
            "line_hashes": [
                "314669114127214206941191837999180491419",
                "65734818014945278580344814902558745899",
                "177405024897822420457758788821448099790",
                "225847155566421643133302173562872750889",
                "234598909790281932601038328374309982589",
                "208159626100173812426223873924061901334",
                "252008842346387433472178132375686175884",
                "122239347192010381286493971473416362239",
                "7032513319386658241733258425947740844",
                "115679024746737187962769538353380490362",
                "177450214957797854408443010396088667530",
                "306912640794738765172445825369295727916",
                "50376017993905550568569054536298303313",
                "198035267221702008425483894545954342490",
                "8226933511286249839914699664771962011",
                "70388691493598608008399969543868429077"
            ],
            "threshold": 0.9
        },
        "deprecated": false
    },
    {
        "signature_version": "v1",
        "target": {
            "function": "mp_import_all",
            "file": "py/runtime.c"
        },
        "id": "CVE-2026-1998-38e0d7a6",
        "signature_type": "Function",
        "source": "https://github.com/dpgeorge/micropython/commit/570744d06c5ba9dba59b4c3f432ca4f0abd396b6",
        "digest": {
            "function_hash": "30212119845419580799864898971790395502",
            "length": 785.0
        },
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-07-15T15:53:42Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1998.json"