Vulnerability · Published Feb 26, 2026 · Assigned by VulnCheck
CVE-2026-23747Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow
Low 3.7
In plain English
A low-severity stack buffer overflow 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 0.3% (higher than 28% of all known vulnerabilities).
Official description
Golioth Firmware SDK version 0.10.0 prior to 0.22.0, fixed in commit 48f521b, contain a stack-based buffer overflow in Payload Utils. The golioth_payload_as_int() and golioth_payload_as_float() helpers copy network-supplied payload data into fixed-size stack buffers using memcpy() with a length derived from payload_size. The only length checks are guarded by assert(); in release builds, the asserts are compiled out and memcpy() may copy an unbounded payload_size. Payloads larger than 12 bytes (int) or 32 bytes (float) can overflow the stack, resulting in a crash/denial of service. This is reachable via LightDB State on_payload with a malicious server or MITM.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Golioth | Firmware SDK | 0.10.0 – before 0.22.0 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://secmate.dev/disclosures/SECMATE-2025-0015 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/48f521bcc0187ada2b9cbdad31dc380e6c7b7332 patch
- https://www.vulncheck.com/advisories/golioth-firmware-sdk-payload-utils-stack-based-buffer-overflow third-party-advisory