CVE-2026-23749

Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read

Published Feb 26, 2026 CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed

Description

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).

Analysis

Technical impact

Golioth Firmware SDK versions prior to 0.22.0 contain an out‑of‑bounds read that results from copying a blockwise transfer path into a fixed‑size buffer without appending a terminating NUL byte. The buffer is later processed with a strlen call, allowing the code to read beyond the allocated memory and trigger a crash. This flaw is a classic example of CWE‑170 Improper Null Termination and can lead to a denial of service for the device that is running the vulnerable SDK.

Affected Systems

The vulnerability affects all releases of the Golioth Firmware SDK with versions 0.19.1 and earlier than 0.22.0. The issue is fixed in commit 0e788217 and subsequent releases such as 0.22.0 and later.

Risk and Exploitability

The CVSS score of 2.1 indicates low overall severity, and the EPSS score of less than 1% suggests a low likelihood of exploitation. The flaw is not listed in the CISA KEV catalog. The attack surface is limited to application‑controlled input; the vulnerability is not remotely exploitable over the network by default. Even though exploitation would only cause a crash, the limited scope reduces the urgency but still warrants mitigation by upgrading the SDK.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Golioth

Firmware SDK

unaffected

Version	Status	Constraints
`0.19.1`	affected	< 0.22.0
`0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d`	unaffected	—

No data.

Vendor Product Versions

Golioth

Firmware Sdk

Version	Status	Scheme	Platform
`[0.19.1,0.22.0)`	affected	semver	—
`commit 0e788217`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the Golioth Firmware SDK to version 0.22.0 or newer to eliminate the null‑termination bug.
If an immediate SDK upgrade is infeasible, review and sanitize all application‑controlled paths passed to blockwise_transfer_init so that they are properly null‑terminated and within the maximum path length limits before being processed by the SDK.
After applying changes, monitor device logs for any unexpected crashes or reboots that might indicate leftover vulnerabilities or path handling errors.

Generated by OpenCVE AI on April 16, 2026 at 06:01 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.184% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/
https://github.com/golioth/golioth-firmware-sdk/commit/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d
https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0
https://secmate.dev/disclosures/SECMATE-2025-0017
https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read

History

Feb 27, 2026 6:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Feb 27, 2026 3:00 PM Added references View changes

Type	Values Removed	Values Added
References		https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/

Feb 27, 2026 9:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Golioth Golioth firmware Sdk
Vendors & Products		Golioth Golioth firmware Sdk

Feb 26, 2026 7:15 PM Added references View changes

Type	Values Removed	Values Added
References		https://secmate.dev/disclosures/SECMATE-2025-0017

Feb 26, 2026 6:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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).
Title		Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read
Weaknesses		CWE-170
References		https://github.com/golioth/golioth-firmware-sdk/commit/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0 https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read
Metrics		cvssV3_1 `{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}` cvssV4_0 `{'score': 2.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}`