CVE-2026-55782

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Source

https://cve.org/CVERecord?id=CVE-2026-55782

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55782.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55782

Aliases

GHSA-qxhc-2v6p-wm8m

Published

2026-07-10T16:46:38Z

Modified

2026-08-12T16:41:21Z

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: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields

Details

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validating them against the data present in the file. A tiny crafted module can force multi-gigabyte allocations during listing or extraction through NameSize, Information.Size, and std::string or vector allocation paths, causing memory exhaustion or process termination. This issue is fixed in version 6.5.1749.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55782.json"
}

References

Affected packages

Git / github.com/m2team/nanazip

Affected ranges

Type

GIT

Repo

https://github.com/m2team/nanazip

Events

Introduced

Fixed

1ce90f2d14a984476d0407a835273705607facf2

Fixed

56aee89037947410dd5e66f3a087e0f290484bae

Fixed

92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6

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-2026-55782.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "192846759888911383859741309150996576967",
                "266701842849406305084208735189006073237",
                "340121456227470511554157713558246438822",
                "255815476832353132545526818084132590566",
                "72230822934347060279839640520500445430",
                "119136196776460121848352152578145315010",
                "116427903683559173252800947179820584100",
                "294908209834283291070506350729945153719",
                "289587315599161492527330618885564026296",
                "20123223017741590463571029239013846574",
                "295199347253306461764021780364788473416",
                "9617303006230846534312638209332649011",
                "10982232791494681259655124897382228750",
                "311054053352331414085906877835939780305",
                "57791665095195085617219570642334155767",
                "333522260152813121733391263655994184138",
                "163378525874246921743239564890505453879",
                "269212974031789421428099975915486264603",
                "175237493131711291472633283323163151065",
                "33445783729109942383723512789340694163",
                "156165917633842785453431893139871308168",
                "152258499651537933706829059584068896032",
                "228604177786423152750631582884480358186",
                "24902853048044737428129183262901080498",
                "202474866017284265941505877329760240005",
                "250979059774671345138032528798654148026",
                "130181662717215204812807417604855545044",
                "285038014836939290716237267871333610944"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55782-612b79a9",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/m2team/nanazip/commit/56aee89037947410dd5e66f3a087e0f290484bae",
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "196170432935457569890490032121272913896",
                "42831872171043228618295882771603735068",
                "100517119506183486829063712872858080865",
                "213211550476597944107846187334332740192"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-55782-83e8cd6d",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/m2team/nanazip/commit/92b12a6e1eb0cf8e88fcc277aa7508ca1ff27db6",
        "target": {
            "file": "NanaZip.Codecs/NanaZip.Codecs.Archive.WebAssembly.cpp"
        }
    }
]

vanir_signatures_modified

"2026-08-12T16:41:21Z"