Vulnerability in Golioth Firmware Sdk
CVE-2026-23749
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).
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (5.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Golioth Firmware Sdk — versions 0.19.1, 0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d
Weakness classification (CWE)
References
- secmate.dev/disclosures/SECMATE-2025-0017 (technical-description)
- blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/ (technical-description, exploit)
- github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0 (release-notes)
- github.com/golioth/golioth-firmware-sdk/commit/0e788217ab4b61a7c1d9fadd1b4a40f5… (patch)
- www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-o… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-23749?
- CVE-2026-23749 is a low-severity vulnerability in Golioth Firmware Sdk, classified under Improper Null Termination. CVSS score: 2.9/10. Published 2026-02-26.
- How severe is CVE-2026-23749?
- Low severity. CVSS v3 base score is 2.9 out of 10.