# CVE-2026-23749

## Summary

- **CVE ID:** CVE-2026-23749
- **Severity:** LOW
- **CVSS Score:** 2.9 (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)
- **CWE:** CWE-170
- **Published:** Feb 26, 2026
- **Last Modified:** Jul 14, 2026

## 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).

## Affected Products

- Golioth — Firmware SDK (0.19.1)
- Golioth — Firmware SDK (commit 0e788217)
- Golioth — Firmware SDK (0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._