CVE-2025-34468

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

The following products are affected by CVE-2025-34468 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-34468.

URL	Resource
https://github.com/obgm/libcoap/commit/30db3ea
https://github.com/obgm/libcoap/pull/1737
https://libcoap.net/
https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-address-resolution-dos-or-potential-rce