PatchTheCVECVE-2026-25139: RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi
CVE-2026-25139 is a critical-severity flaw (CVSS 9.1) affecting riot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In version 2025.10 and prior, multiple out-of-bounds read allow any unauthenticated user, with ability to send or manipulate input packets, to read adjacent memory locations, or crash a vulnerable device running the 6LoWPAN stack. The received packet is cast into a sixlowpan_sfr_rfrag_t struct
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.1 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 54%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-02-04 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-25139?
riot: upgrade to newer than 2025.10. Exact commands for each OS are on this page.
Is CVE-2026-25139 being exploited?
CVE-2026-25139 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-25139 affect?
CVE-2026-25139 affects riot. Severity is critical (CVSS 9.1). RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In version 2025.10 and prior, multiple out-of-bounds read allow any unauthenticated
How urgent is CVE-2026-25139?
Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2025-66647 CRITICAL 9.8 UPGRADE RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi
- CVE-2025-66646 HIGH 7.5 UPGRADE RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Thi
- CVE-2026-22214 CRITICAL 9.8 UPGRADE RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in
- CVE-2026-22213 CRITICAL 9.8 UPGRADE RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in
- CVE-2025-53888 CRITICAL 9.8 UPGRADE RIOT-OS, an operating system that supports Internet of Things devices, has an ineffective size check implement