CVE-2026-22213: RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in

Q: How do I fix CVE-2026-22213?

riot: upgrade to 2025.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-22213 being exploited?

CVE-2026-22213 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-22213 affect?

CVE-2026-22213 affects riot. Severity is critical (CVSS 9.8). RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a dev

Q: How urgent is CVE-2026-22213?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-22213 is a critical-severity flaw (CVSS 9.8) affecting riot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a device path using unbounded user-controlled input. The utility uses strcpy() and strcat() to concatenate the fixed prefix '/dev/' with a user-supplied device name provided via the -s command-line option without bo

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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-01-12
Last modified	2026-07-14

Publisher (CNA): VulnCheck · Vendor: riot-os

Last updated 2026-07-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-12 23:15 UTCPublished CVE record published
2026-07-14 16:16 UTCUpdated Record last modified

riot-os riot UPGRADE

Affected: < 2025.10 · 2026.01 devel · 2026.01 rc1

Fixed in: 2025.10

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-22213?

riot: upgrade to 2025.10. Exact commands for each OS are on this page.

Is CVE-2026-22213 being exploited?

CVE-2026-22213 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-2026-22213 affect?

CVE-2026-22213 affects riot. Severity is critical (CVSS 9.8). RIOT OS versions up to and including 2026.01-devel-317 contain a stack-based buffer overflow vulnerability in the tapslip6 utility. The vulnerability is caused by unsafe string concatenation in the devopen() function, which constructs a dev

How urgent is CVE-2026-22213?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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