CVE-2026-107838

Published: Ott 09, 2026 Last Modified: Ott 09, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. From version 2023.07 through version 2026.07, nanocoap_fileserver callers in sys/net/application_layer/nanocoap/fileserver.c ignore a failure returned by _resp_init() when coap_build_reply() cannot fit a response header into the response buffer. A remote client can send a CoAP request with a sufficiently large extended token when nanocoap_token_ext is enabled, causing response initialization to fail while _get_file() or _get_directory() continues with stale response state. The path then reaches _calc_szx2() and its pdu->payload_len > reserve assertion, terminating the affected service or device task. No fixed release is available as of this review.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0034
Percentile
0,3th
Updated

EPSS Score Trend (Last 2 Days)

252

Unchecked Return Value

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Integrity
Potential Impacts:
Unexpected State Dos: Crash, Exit, Or Restart
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: Low
View CWE Details
617

Reachable Assertion

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability
Potential Impacts:
Dos: Crash, Exit, Or Restart
Applicable Platforms
Languages: Not Language-Specific, C, Java, Rust
View CWE Details
https://github.com/RIOT-OS/RIOT/commit/d3a47289c58d108575a1…
https://github.com/RIOT-OS/RIOT/commit/d3a47289c58d108575a19e623e4d3f647659e743
https://github.com/RIOT-OS/RIOT/pull/22745
https://github.com/RIOT-OS/RIOT/pull/22745
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-39…
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-39j3-3v73-5mj2