CVE-2026-107838

waiting for further signals

GHSA-39j3-3v73-5mj2 ↗EUVD-2026-95933 ↗

no check availablenot proven exploitable

cve.orgpublic pockev

RIOT-OS RIOT Since 2023.07

CWE-252 Unchecked Return Value

ETK-2026-1106, permanent identifier

cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

11d 06h 47msince last run

45mAI analysis

timeline

0 = cve.org publication

trigger signal (cve.org) +0hwaiting for further signals+5h05m

+2h

+4h

+6h

+8h

+10h

+12h

description

RIOT versions 2023.07 through 2026.07 can terminate a nanocoap_fileserver service or device task after processing a malformed CoAP request. Exposure requires nanocoap_token_ext to be enabled and an attacker able to reach the affected CoAP service.

mitigation

Disable nanocoap_token_ext where it is not required, and restrict access to CoAP services to trusted networks or clients. Monitor RIOT for an updated release, as no fixed version is currently recorded.

check

exploit

automation

–

auth required

EPSS

0.34%25th percentile

agent run time

45m

cve.org record, t = 0

2026-10-09 17:55Z

Δ to public poc

–

Δ to kev

–

outcome

No artifact: an exploit or check was attempted but could not be produced at this moment.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

2026-10-09 17:55Z
cve_org: trigger signal, started the run
https://www.cve.org/CVERecord?id=CVE-2026-107838

this entry in the feed

GET /api/v1/feed/CVE-2026-107838

{
  "etk_id": "ETK-2026-1106",
  "cve_id": "CVE-2026-107838",
  "display_id": "CVE-2026-107838",
  "ghsa_id": "GHSA-39j3-3v73-5mj2",
  "euvd_id": "EUVD-2026-95933",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Remote denial of service in RIOT nanocoap_fileserver",
  "summary": "RIOT versions 2023.07 through 2026.07 can terminate a nanocoap_fileserver service or device task after processing a malformed CoAP request. Exposure requires nanocoap_token_ext to be enabled and an attacker able to reach the affected CoAP service.",
  "mitigation": "Disable nanocoap_token_ext where it is not required, and restrict access to CoAP services to trusted networks or clients. Monitor RIOT for an updated release, as no fixed version is currently recorded.",
  "vendor": "RIOT-OS",
  "product": "RIOT",
  "affected": [
    {
      "affected_notes": [
        "Since 2023.07"
      ],
      "affected_ranges": [],
      "ecosystem": "riot os",
      "fixed_versions": [],
      "package_name": null,
      "purl": null
    }
  ],
  "cwes": [
    252
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0034,
  "epss_percentile": 0.2588,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 44.57565843333333,
  "t0_at": "2026-10-09T17:55:34.670000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-09T17:55:34.670000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-09T17:55:34.670000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-107838"
    }
  }
}

published 2026-10-09 22:16Z
last change 2026-10-21 05:31Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.