CVE-2026-28525

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Source
https://cve.org/CVERecord?id=CVE-2026-28525
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28525.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-28525
Downstream
Published
2026-04-23T20:59:31Z
Modified
2026-08-12T10:14:50Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
SWUpdate Integer Underflow in Multipart Upload Parser
Details

SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-125",
        "CWE-191"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28525.json"
}
References

Affected packages

Git / github.com/sbabic/swupdate

Affected ranges

Type
GIT
Repo
https://github.com/sbabic/swupdate
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
beee2dc0feef1cfe84f1aa6fc980e104b2e47a74
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:swupdate:swupdate:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2025.12"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

2014.*
2014.07
2015.*
2015.07
2016.*
2016.04
2016.04-rc1
2016.07
2016.07-rc3
2016.10
2016.10-rc1
2017.*
2017.01
2017.01-rc1
2017.04
2017.04-rc1
2017.04-rc2
2017.07
2017.07-rc1
2017.11
2018.*
2018.03
2018.03-rc1
2018.11
2018.11-rc1
2019.*
2019.04
2019.04-rc1
2019.11
2019.11-rc1
2020.*
2020.04
2020.04-rc1
2020.04-rc2
2020.11
2021.*
2021.04
2021.11
2022.*
2022.05
2022.12
2023.*
2023.05
2023.12
2023.12.1
2024.*
2024.05
2024.05.2
2024.12
2025.*
2025.05
2025.12

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28525.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "261301284143953164733188684170922853212",
                "166407847492580451621814776465903320027",
                "120843071704566545832583583724607744187",
                "227203042142023633801334446307692952270",
                "204334966344308317893341220996636321196",
                "46850404059834191322263561260090678663",
                "237714158132649472676258792631911620255",
                "70080442176158044704405200258013963973",
                "337888838859988853056898005289698702121"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-28525-10563536",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/sbabic/swupdate/commit/beee2dc0feef1cfe84f1aa6fc980e104b2e47a74",
        "target": {
            "file": "mongoose/mongoose_multipart.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "161148870598418683672942965395922594176",
            "length": 815
        },
        "id": "CVE-2026-28525-a9cae246",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/sbabic/swupdate/commit/beee2dc0feef1cfe84f1aa6fc980e104b2e47a74",
        "target": {
            "file": "mongoose/mongoose_multipart.c",
            "function": "mg_http_multipart_continue_wait_for_chunk"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T10:14:50Z"