CVE-2026-107838 RIOT - Denial of Service

RIOT 2023.07 through 2026.07 contains a denial of service caused by ignoring failure from _resp_init() when coap_build_reply() cannot fit a response header, letting remote clients with large extended tokens terminate service, exploit requires nanocoap_token_ext enabled.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-252

Vendor fix

Update to the latest version once a fix is released.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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