Out-of-bounds Write Affecting riot-os/riot package, versions [,2026.04-rc1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-RIOTOSRIOT-15474690
- published12 Mar 2026
- disclosed11 Mar 2026
- creditPaschal Amusuo
Introduced: 11 Mar 2026
CVE-2026-27703 (opens in a new tab)How to fix?
Upgrade riot-os/riot to version 2026.04-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write via the coap_well_known_core_default_handler() function. An attacker can corrupt adjacent stack memory, including critical addresses such as the return address, by sending specially crafted option data, potentially resulting in denial of service or execution of arbitrary code.