CVE-2026-27703

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Source
https://cve.org/CVERecord?id=CVE-2026-27703
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27703.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-27703
Aliases
  • GHSA-qgj4-9jff-93cj
Published
2026-03-11T19:38:02Z
Modified
2026-08-12T03:51:36Z
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
RIOT has an Out-of-Bounds Write in nanoCoAP Handler
Details

RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In 2026.01 and earlier, the default handler for the well_known_core resource coap_well_known_core_default_handler writes user-provided option data and other data into a fixed size buffer without validating the buffer is large enough to contain the response. This vulnerability allows an attacker to corrupt neighboring stack location, including security-sensitive addresses like the return address, leading to denial of service or arbitrary code execution.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27703.json"
}
References

Affected packages

Git / github.com/riot-os/riot

Affected ranges

Type
GIT
Repo
https://github.com/riot-os/riot
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
c699e2e20a6c2d0fd45daa766d7a192cb33e579f
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2026.01"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

2013.*
2013.08
2014.*
2014.01
2014.05
2014.12
2015.*
2015.09-RC1
2015.12-RC1
2015.12-devel
2016.*
2016.03-devel
2016.04-RC1
2016.07-RC1
2016.07-RC2
2016.07-devel
2016.10-RC1
2016.10-devel
2017.*
2017.01-RC1
2017.01-devel
2017.04-RC1
2017.04-devel
2017.07-RC1
2017.07-devel
2017.10-RC1
2017.10-devel
2018.*
2018.01-RC1
2018.01-devel
2018.04-RC1
2018.04-devel
2018.07-RC1
2018.07-devel
2018.10-RC1
2018.10-devel
2019.*
2019.01-RC1
2019.01-devel
2019.04-RC1
2019.04-devel
2019.07-RC1
2019.07-devel
2019.10-RC1
2019.10-devel
2020.*
2020.01-RC1
2020.01-devel
2020.04-RC1
2020.04-devel
2020.07-RC1
2020.07-devel
2020.10-RC1
2020.10-devel
2021.*
2021.01-RC1
2021.01-devel
2021.04-RC1
2021.04-devel
2021.07-RC1
2021.07-devel
2021.10-RC1
2021.10-devel
2022.*
2022.01-RC1
2022.01-devel
2022.04-RC1
2022.04-devel
2022.07-RC1
2022.07-devel
2022.10-RC1
2022.10-devel
2023.*
2023.01-RC1
2023.01-devel
2023.04-RC1
2023.04-devel
2023.07-RC1
2023.07-devel
2023.10-RC1
2023.10-devel
2024.*
2024.01-RC1
2024.01-devel
2024.04
2024.04-RC1
2024.04-devel
2024.07-RC1
2024.07-devel
2024.10-RC1
2024.10-devel
2025.*
2025.01-RC1
2025.01-devel
2025.04-RC1
2025.04-devel
2025.07-RC1
2025.07-devel
2025.10-RC1
2025.10-devel
2026.*
2026.01-devel

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27703.json"