CVE-2026-55780

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Source

https://cve.org/CVERecord?id=CVE-2026-55780

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55780.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55780

Aliases

GHSA-ppm9-5267-rq72

Published

2026-07-10T16:49:26Z

Modified

2026-08-12T16:41:22Z

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: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() via unvalidated entry Size

Details

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad_alloc or std::length_error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-248",
        "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55780.json"
}

References

Affected packages

Git / github.com/m2team/nanazip

Affected ranges

Type

GIT

Repo

https://github.com/m2team/nanazip

Events

Introduced

Fixed

ad62e3b4970b9f01e924c99094d6fed7a42f849a

Fixed

1eaba2b09dfd3c78dab55e629ad4024d97d03567

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "6.5.1749.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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-2026-55780.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "315188912000115882754404373912840568709",
                "177940120668615089161421745423354231425",
                "138293208154897237543607965250878966507",
                "255815476832353132545526818084132590566",
                "72230822934347060279839640520500445430",
                "119136196776460121848352152578145315010",
                "116427903683559173252800947179820584100",
                "94010410761098609881598781513680625913",
                "134701515468151215158464127224574049419",
                "315810737052818224549373437423691380257",
                "186666267216079120367728101871977403844",
                "152017617175902208498508554140292249757",
                "79575299956671986177045065917105801872",
                "279209230236177889309045888579406176068",
                "109921930642278193515034058474720104008",
                "294908209834283291070506350729945153719",
                "81906934469131181591569157117684547537",
                "326475409356596035881727584277319928138",
                "126186387591407293451475717597801071379",
                "79367413209750831416900791164368610987",
                "252424078108871288171342700229595273240",
                "39823970628663323615217294049242890417",
                "209759455606900177029434796192150762760",
                "339645066315887261716137364737623353275",
                "304129217278324346793297817323743097076",
                "140728430451372136360551244596546411753",
                "259129107027915318146335482253501484467",
                "163378525874246921743239564890505453879",
                "269212974031789421428099975915486264603",
                "175237493131711291472633283323163151065",
                "33445783729109942383723512789340694163",
                "116104722400436786173944096526014579947",
                "112609821587657365105349932535058000098",
                "268573617813679025818458958909193903728",
                "228604177786423152750631582884480358186",
                "24902853048044737428129183262901080498",
                "202474866017284265941505877329760240005",
                "250979059774671345138032528798654148026",
                "130181662717215204812807417604855545044",
                "285038014836939290716237267871333610944"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55780-1039cd42",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/m2team/nanazip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a",
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp"
        }
    }
]

vanir_signatures_modified

"2026-08-12T16:41:22Z"