---
id: CVE-2026-23748
title: Golioth Firmware SDK < 0.22.0 LightDB State Out-of-Bounds Read
summary: "Golioth Firmware SDK version\_0.10.0 prior to 0.22.0, fixed in commit\_d7f55b38, contain an out-of-bounds read in LightDB State string parsing. When processing a string payload, a payload_size value less than 2 can cause a size_t underflow…"
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-191
vendor: Golioth
product: Firmware SDK
affected:
  - firmware_sdk >= 0.10.0 < 0.22.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-02-27T16:06:13.053978Z'
exploitAvailable: true
published: '2026-02-26'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:01:24.257Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23748'
references:
  - url: 'https://secmate.dev/disclosures/SECMATE-2025-0016'
  - url: 'https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/'
  - url: 'https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0'
    label: Firmware SDK 0.22.0 Release Notes
  - url: >-
      https://github.com/golioth/golioth-firmware-sdk/commit/d7f55b380d8be8b29bd101ce06e421af2e88c12b
  - url: >-
      https://www.vulncheck.com/advisories/golioth-firmware-sdk-lightdb-state-out-of-bounds-read
tags:
  - cve.org
  - exploit-available
epss: 0.00308
epssPercentile: 0.23835
ingestedAt: '2026-11-08T14:51:22.472Z'
---

## Overview

Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit d7f55b38, contain an out-of-bounds read in LightDB State string parsing. When processing a string payload, a payload_size value less than 2 can cause a size_t underflow when computing the number of bytes to copy (nbytes). The subsequent memcpy() reads past the end of the network buffer, which can crash the device. The condition is reachable from on_payload, and golioth_payload_is_null() does not block payload_size==1. A malicious server or MITM can trigger a denial of service.

## Affected

- `firmware_sdk >= 0.10.0 < 0.22.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.