CVE-2026-23747 Golioth Firmware SDK < 0.22.0 Payload Utils Stack-based Buffer Overflow
A stack-based buffer overflow in Golioth Firmware SDK allows remote attackers to cause a denial of service via malicious payloads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-23747?
CVE-2026-23747 is a medium-severity memory corruption vulnerability in Golioth Firmware SDK, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-121
Which versions are affected by CVE-2026-23747?
How do I fix CVE-2026-23747?
No fix has been published for CVE-2026-23747 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23747 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23747 exists.
Sources
Also known as GHSA-5wx9-6p5v-7r76.