CVE Explorer
CVE-2026-27703
RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In 2026.01 and earlier, the default handler for the well_known_core resource coap_well_known_core_default_handler writes user-provided option data and other data into a fixed size buffer without validating the buffer is large enough to contain the response. This vulnerability allows an attacker to corrupt neighboring stack location, including
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"RIOT","vendor":"RIOT-OS","versions":[{"status":"affected","version":"<= 2026.01"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:1fbc83884a1df83b4d4e70f234486be46abbbf5a9f040eee85185983644869d8 · sha256:76d503c34bfa8899… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:1fbc83884a1df83b4d4e70f234486be46abbbf5a9f040eee85185983644869d8 · sha256:76d503c34bfa8899… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:1fbc83884a1df83b4d4e70f234486be46abbbf5a9f040eee85185983644869d8 · sha256:76d503c34bfa8899… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-qgj4-9jff-93cj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-qgj4-9jff-93cj"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:1fbc83884a1df83b4d4e70f234486be46abbbf5a9f040eee85185983644869d8 · sha256:76d503c34bfa8899… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.