---
id: CVE-2026-23749
title: Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read
summary: "Golioth Firmware SDK version\_0.19.1\_prior to 0.22.0, fixed in commit\_0e788217, contain an out-of-bounds read due to improper null termination of a blockwise transfer path. blockwise_transfer_init() accepts a path whose length equals CONF…"
severity: low
cvss: 2.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-170
vendor: Golioth
product: Firmware SDK
affected:
  - firmware_sdk >= 0.19.1 < 0.22.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-02-27T17:55:58.632725Z'
exploitAvailable: true
published: '2026-02-26'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:01:24.962Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23749'
references:
  - url: 'https://secmate.dev/disclosures/SECMATE-2025-0017'
  - 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/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d
  - url: >-
      https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read
tags:
  - cve.org
  - exploit-available
epss: 0.00184
epssPercentile: 0.0802
ingestedAt: '2026-11-08T14:51:22.472Z'
---

## Overview

Golioth Firmware SDK version 0.19.1 prior to 0.22.0, fixed in commit 0e788217, contain an out-of-bounds read due to improper null termination of a blockwise transfer path. blockwise_transfer_init() accepts a path whose length equals CONFIG_GOLIOTH_COAP_MAX_PATH_LEN and copies it using strncpy() without guaranteeing a trailing NUL byte, leaving ctx->path unterminated. A later strlen() on this buffer (in golioth_coap_client_get_internal()) can read past the end of the allocation, resulting in a crash/denial of service. The input is application-controlled (not network by default).

## Affected

- `firmware_sdk >= 0.19.1 < 0.22.0`

## Remediation

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