Vulnerability · Published Feb 26, 2026 · Assigned by VulnCheck

CVE-2026-23749Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read

Low 2.9

In plain English

A low-severity security flaw in Firmware SDK from Golioth. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)2.9Low

Exploit odds (30 days)0.2%top 92.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Golioth	Firmware SDK	0.19.1 – before 0.22.0

Weakness: CWE-170 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://secmate.dev/disclosures/SECMATE-2025-0017 technical-description
https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure/ technical-description, exploit
https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0 release-notes
https://github.com/golioth/golioth-firmware-sdk/commit/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d patch
https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read third-party-advisory