CVE-2026-107836 RIOT - Denial of Service

RIOT <= 2026.07 contains a denial of service caused by improper validation of Block2 response block size in nanocoap_sock_get_slice(), letting malicious CoAP servers crash the client and expose adjacent memory, exploit requires a malicious CoAP server.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.29% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-125

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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