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
2026-07-10T16:49:26.257Z
Modified
2026-08-04T11:51:10.843958668Z
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::badalloc or std::lengtherror can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.

Database specific 
{
    "cwe_ids": [
        "CWE-248",
        "CWE-400"
    ],
    "cna_assigner": "GitHub_M",
    "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
0 Unknown introduced commit / All previous commits are affected
Fixed
1eaba2b09dfd3c78dab55e629ad4024d97d03567
Database specific 
{
    "source": "AFFECTED_FIELD",
    "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-2026-55780.json"