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

2026-07-15T01:49:13.546946523Z

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

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

References

Affected packages

Git / github.com/m2team/nanazip

Affected ranges

Type

GIT

Repo

https://github.com/m2team/nanazip

Events

Introduced

Fixed

5d74d90b737ac7096e5d944a5a3070c5c6a8f894

Fixed

1eaba2b09dfd3c78dab55e629ad4024d97d03567

Database specific

{
    "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"