{"id":"CVE-2026-107837","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-107837","generatedAt":"2026-10-28T06:35:51.907Z","title":"A remote attacker can send a malformed 6LoWPAN fragment that causes gnrc_sixlowpan_frag_recv() to read beyond the packet buffer, potentially disclosing memory and crashing the network stack.","description":"RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. In 2026.07 and earlier, _receive() in sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c can route an undersized packet into SFF fragment handling after only a minimal payload check. The code then interprets the packet as a sixlowpan_frag_t or larger fragment header without verifying that the packet snip contains the required bytes. A remote attacker can send a malformed 6LoWPAN fragment that causes gnrc_sixlowpan_frag_recv() to read beyond the packet buffer, potentially disclosing memory and crashing the network stack. No fixed repository release is available as of this review.","published":"2026-10-09T18:17:05.000Z","lastModified":"2026-10-16T17:17:04.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"},"cwe":["CWE-125"],"affected":[],"epss":{"score":0.00378,"percentile":0.31563,"date":"2026-10-27","history":[{"date":"2026-10-10","score":0.00378,"percentile":0.29718}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-09T18:17:05.000Z","detail":{"score":"8.2","severity":"HIGH","publishedAt":"2026-10-09T18:17:05.483Z"},"summary":"New CVE, high severity (CVSS 8.2)."}],"references":[{"url":"https://github.com/RIOT-OS/RIOT/commit/0cae205cd1d110e0b8fce094714598322d56ce2d","source":"security-advisories@github.com"},{"url":"https://github.com/RIOT-OS/RIOT/pull/22504","source":"security-advisories@github.com"},{"url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-m8mc-q4p7-p8j3","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-107837","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}