CVE-2026-21878

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Source

https://cve.org/CVERecord?id=CVE-2026-21878

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21878.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-21878

Aliases

GHSA-p8rx-c26w-545j

Published

2026-02-13T18:10:26.325Z

Modified

2026-07-08T07:15:46.319039082Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator

Summary

BACnet Stack Improperly Limits Pathnames to a Restricted Directory

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.

Database specific

{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "fixed": "1.5.0.rc3"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21878.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-22"
    ]
}

References

Affected packages

Git / github.com/bacnet-stack/bacnet-stack

Affected ranges

Type

GIT

Repo

https://github.com/bacnet-stack/bacnet-stack

Events

Introduced

Fixed

c5dc00a77b4bc2550befa67a930b333e299c18f3

Database specific

{
    "source": "REFERENCES"
}

Affected versions

bacnet-stack-1.*

bacnet-stack-1.0.0

bacnet-stack-1.1.1

bacnet-stack-1.2.0

bacnet-stack-1.3.0

bacnet-stack-1.3.1

bacnet-stack-1.3.2

bacnet-stack-1.3.3

bacnet-stack-1.3.4

bacnet-stack-1.3.5

bacnet-stack-1.3.6

bacnet-stack-1.3.7

bacnet-stack-1.3.8

bacnet-stack-1.4.0

bacnet-stack-1.4.1

bacnet-stack-1.4.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21878.json"