CVE-2026-23748 Golioth Firmware SDK < 0.22.0 LightDB State Out-of-Bounds Read
A size_t underflow in LightDB State parsing allows a malicious server to trigger an out-of-bounds read, crashing IoT devices.
- 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-2026-23748?
CVE-2026-23748 is a medium-severity 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 d7f55b38, contain an out-of-bounds read in LightDB State string parsing. When processing a string payload, a payload_size value less than 2 can cause a size_t underflow when computing the number of bytes to copy (nbytes). The subsequent memcpy() reads past the end of the network buffer, which can crash the device. The condition is reachable from on_payload, and golioth_payload_is_null() does not block payload_size==1. A malicious server or MITM can trigger a denial of service.
Weakness: CWE-191
Which versions are affected by CVE-2026-23748?
How do I fix CVE-2026-23748?
No fix has been published for CVE-2026-23748 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-23748 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23748 exists.
Sources
Also known as GHSA-h52p-5g3g-rxjm.