CVE-2026-45820

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Source

https://cve.org/CVERecord?id=CVE-2026-45820

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45820.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-45820

Published

2026-07-22T06:57:13.726Z

Modified

2026-07-25T03:56:32.296652820Z

Severity

6.6 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/S:N/AU:Y/R:U/V:D/RE:M/U:Amber CVSS Calculator

Summary

[none]

Details

fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads returning undefined, which coerces to 0, keeping the loop condition permanently true.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45820.json",
    "cwe_ids": [
        "CWE-400",
        "CWE-835"
    ],
    "cna_assigner": "seal",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "0.5.0"
                },
                {
                    "last_affected": "0.5.3"
                },
                {
                    "introduced": "0.6.0"
                },
                {
                    "last_affected": "0.6.10"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/101arrowz/fflate

Affected ranges

Type

GIT

Repo

https://github.com/101arrowz/fflate

Events

Introduced

Fixed

d3243651cb142e3e04f3e4bc037b9e985878f444

Database specific

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.8.2"
        }
    ],
    "source": "DESCRIPTION"
}

Affected versions

v0.*

v0.4.8

v0.5.2

v0.6.0

v0.6.3

v0.6.4

v0.6.9

v0.7.0

v0.7.1

v0.7.2

v0.7.4

v0.8.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45820.json"