CVE-2026-23749 Golioth Firmware SDK < 0.22.0 Blockwise Transfer Path Out-of-Bounds Read
An out-of-bounds read in the Golioth Firmware SDK can cause a crash when processing blockwise transfer paths, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-23749?
CVE-2026-23749 is a low-severity memory corruption vulnerability in Golioth Firmware SDK, published on 26 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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).
Weakness: CWE-170
Which versions are affected by CVE-2026-23749?
How do I fix CVE-2026-23749?
No fix has been published for CVE-2026-23749 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-2026-23749 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23749 exists.
Sources
Also known as GHSA-2qjx-h626-j6v4.