Medium

Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow

Type: advisorySources: OSV

Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit 48f521b, contain a stack-based buffer overflow in Payload Utils. The golioth_payload_as_int() and golioth_payload_as_float() helpers copy network-supplied payload data into fixed-size stack buffers using memcpy() with a length derived from payload_size. The only length checks are guarded by assert(); in release builds, the asserts are compiled out and memcpy() may copy an unbounded payload_size. Payloads larger than 12 bytes (int) or 32 bytes (float) can overflow the stack, resulting in a crash/denial of service. This is reachable via LightDB State on_payload with a malicious server or MITM.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-23747
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 03:47 UTC · Revision 1

Source evidence

Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow

core-osv · Original source

Published 26 Feb 2026, 17:30 UTC

osv:CVE-2026-23747

Complete source record

{
  "id": "f75eeac8affef19461b8e916d648558978a0b119ab99800cca524cb7d0d9b943",
  "url": "https://osv.dev/vulnerability/CVE-2026-23747",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow",
    "summary": "Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit 48f521b, contain a stack-based buffer overflow in Payload Utils. The golioth_payload_as_int() and golioth_payload_as_float() helpers copy network-supplied payload data into fixed-size stack buffers using memcpy() with a length derived from payload_size. The only length checks are guarded by assert(); in release builds, the asserts are compiled out and memcpy() may copy an unbounded payload_size. Payloads larger than 12 bytes (int) or 32 bytes (float) can overflow the stack, resulting in a crash/denial of service. This is reachable via LightDB State on_payload with a malicious server or MITM.",
    "evidence": "osv:CVE-2026-23747",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-23747",
      "aliases": [
        "CVE-2026-23747"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/golioth/golioth-firmware-sdk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "35c3085d0686b73b85cb7bd46c75adb828ce6a83"
                },
                {
                  "fixed": "f15281671a9dd5c14a5215021f4469a8e3071b37"
                },
                {
                  "fixed": "48f521bcc0187ada2b9cbdad31dc380e6c7b7332"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.10.0"
                      },
                      {
                        "fixed": "0.22.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f15281671a9dd5c14a5215021f4469a8e3071b37"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.22.0"
                  },
                  {
                    "range": [
                      {
                        "fixed": "48f521bcc0187ada2b9cbdad31dc380e6c7b7332"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.20.0",
            "v0.21.1",
            "v0.21.0",
            "v0.15.0",
            "v0.19.1",
            "v0.19.0",
            "v0.18.1",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.14.0",
            "v0.13.1",
            "v0.13.0",
            "v0.12.2",
            "v0.12.1",
            "v0.12.0",
            "v0.11.1",
            "v0.11.0",
            "v0.10.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23747.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.086383119Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23747.json",
        "https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23747",
        "https://www.vulncheck.com/advisories/golioth-firmware-sdk-payload-utils-stack-based-buffer-overflow",
        "https://github.com/golioth/golioth-firmware-sdk/commit/48f521bcc0187ada2b9cbdad31dc380e6c7b7332",
        "https://github.com/golioth/golioth-firmware-sdk",
        "https://secmate.dev/disclosures/SECMATE-2025-0015",
        "https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-121"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23747.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23747",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509953,
  "published_at": "2026-02-26T17:30:13.495+00:00"
}