CVE-2026-55783

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Source
https://cve.org/CVERecord?id=CVE-2026-55783
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55783.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55783
Aliases
  • GHSA-q67r-9cfh-xc29
Published
2026-07-10T16:48:29.959Z
Modified
2026-08-12T16:41:23.166026Z
Severity
  • 2.4 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive
Details

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.

Database specific 
{
    "cwe_ids": [
        "CWE-476"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55783.json"
}
References

Affected packages

Git / github.com/m2team/nanazip

Affected ranges

Type
GIT
Repo
https://github.com/m2team/nanazip
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5d74d90b737ac7096e5d944a5a3070c5c6a8f894
Fixed
1eaba2b09dfd3c78dab55e629ad4024d97d03567
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "6.5.1749.0"
        }
    ]
}

Affected versions

1.*
1.0
1.0-Preview1
1.0-Preview2
1.0-Preview3
1.0-Preview4
1.1
1.1+ServicingUpdate1-Preview1
1.1+ServicingUpdate1-Preview2
1.1+ServicingUpdate1-Preview3
1.1-Preview1
1.1-Preview2
1.1-Preview2-Update1
1.2
1.2-Preview4
1.2.253
2.*
2.0.313
2.0.376
2.0.396
2.0.450
2.1.451
3.*
3.0.1000.0
3.0.756
3.0.996
3.1.1080.0
3.5.1000.0
3.5.996
5.*
5.0.1188.0
5.0.1215.0
5.0.1243.0
5.0.1250.0
5.0.1252.0
5.0.1263.0
5.1.1252.0
5.1.1263.0
6.*
6.0.1461.0
6.0.1621.0
6.0.1630.0
6.0.1632.0
6.5.1638.0
6.5.1742.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55783.json"
vanir_signatures 
[
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.Littlefs.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-3bd1ce0d",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-772805d7",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.Romfs.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-ac2a20cc",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.Ufs.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-bd77def3",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.ElectronAsar.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-be2e3b5c",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.Zealfs.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-d17c0112",
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "254808223473373215424780900283689901114",
                "236195425211217735908445132284075985033",
                "293148149559065438609497455884367357857",
                "195091144196207828575328413247164032508"
            ]
        },
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp"
        },
        "source": "https://github.com/m2team/nanazip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894",
        "signature_version": "v1",
        "id": "CVE-2026-55783-f286ded6",
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-08-12T16:41:23Z"