CVE-2025-34468 | BDVDB-2026-308721 Detail

Description#

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).

Impact#

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Exploit#

History#

1. Version 12025-12-31Record published in the CVE List.
2. Version 22026-11-08Most recent update recorded in the CVE List.